Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0cce9a633044eea…

MALICIOUS

PDF

251.3 KB Created: 2021-07-05 17:35:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0a43a5be921dd0260f2edd8557012b08 SHA-1: a71a6f9ada574dbe3e2286f2c835ab4c72ce4688 SHA-256: d0cce9a633044eeaeda2cf55161870767c2b167c34a7cc18816f6014fe20fa07
358 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1534 Credentials in Files

The PDF document contains multiple links to known malicious redirectors and impersonates brands like Apple to trick users. It also presents a fake CAPTCHA or human verification prompt, instructing users to run commands, which is a common tactic for credential harvesting or malware delivery. The document's content and heuristics strongly suggest a phishing or social engineering attack aimed at compromising user accounts or executing further malicious code.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 10

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Fake CAPTCHA with command-running instructions critical SE_FAKE_CAPTCHA_CLICKFIX
    Document combines fake CAPTCHA or human-verification language with instructions to paste or run a command — a high-confidence ClickFix pattern
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/1330123889/pubg-uc-shop-bd-game-hack.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/1330123889/pubg-uc-shop-bd-game-hack In PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-codes-on-phone_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-beyond-free-vip-server_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/pubg-uc-via-login_GM1330123889.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/pokemon-go-no-free-raid-pass_GM1094591345.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/cmds-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-link_GM406889139.pdfIn macro / runtime command snippet
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-dont-get-anything-from-survey-varification_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-com-free-codes_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-plus-free_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://www.himalassociationIn macro / runtime command snippet
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_024_off00037fce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37FCE 25928 bytes
SHA-256: b3334eae34600a950b32ed33e5f80a4c661eee904a0478c55ed2a1cf9e485be5
font_01_sfnt_off0003bccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BCCD 18784 bytes
SHA-256: 8bc7e52fdd010b390957fa12262bc603216c44d94ed4a04ff16332c188a3b764

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