Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0c0e5736cde241…

MALICIOUS

PDF

251.7 KB Created: 2021-07-06 07:12:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7a9246401ffc14210c96b3cb7c29b3fd SHA-1: fdefafbeaa587f2c36cb7d0aef2bfaf59ee4db5e SHA-256: 9f0c0e5736cde2415f0b438851964e16f1b0cd11b9215ae607f3ca8828939cbc
258 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Steal Application Access Token T1204.002 Malicious Link

The PDF contains multiple heuristics indicating a credential phishing and MFA harvesting lure, impersonating Apple. It presents a fake CAPTCHA and a 'download' button, directing the user to a malicious URL. The primary lure is a fake generator/game hack, which is a common tactic to trick users into providing sensitive information or approving MFA prompts.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 8

  • 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 / 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-earning-app-2021-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-earning-app-2021-game-hack In PDF document text
    • http://library.persadabunda.ac.id/repository/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-robux-on-roblox-for-free-no-download_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/hack-lecteur-roblox_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/claim-roblox_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/grab-points-login_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_024_off00038103.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x38103 26028 bytes
SHA-256: 9359b7a1fd0ced8912d96d813776601b1b9e57948c88f61138eb5d06ecf83a0e
font_01_sfnt_off0003be40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BE40 18824 bytes
SHA-256: ee16edd751dff77556c8b1eb52d3c074b416d60a0dc31d39e085fb5b8933c53d

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