Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c3afe816c7ec4d…

MALICIOUS

PDF

43.3 KB Created: 2021-05-13 23:34:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 869eebbe9714f2369ff3adabe27b1cf8 SHA-1: 4623a3b81ede63fe5a5e4768d97038b5b0e46937 SHA-256: 76c3afe816c7ec4d3ec6909704d6664de790a817fdb56a021acd5570714ac9b7
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure of game hacks and brand impersonation (Apple) to entice users into clicking a malicious link. The link redirects to infrastructure known for distributing malware, and the document itself displays a fake CAPTCHA to further trick the user. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest an attempt to exploit user interaction for malicious purposes, likely leading to further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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
  • 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: https://netcdn.xyz/app/431946152/robux-hack-generator-game-hack.
  • 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 https://netcdn.xyz/app/431946152/robux-hack-generator-game-hack In PDF document text
    • http://elib.acls-indonesia.com/repository/freecoins_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master-tool-hack_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/i-want-robux_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-roblox-dominus_GM431946152.pdfIn PDF document text
    • http://elib.acls-indonesia.com/repository/free-spins-coin-master-apple_GM406889139.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_003_off00004a72.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A72 26128 bytes
SHA-256: 9e8d13f897e1669ab2b2106c87905f692cb2df6ada744d3add027c1b2dc58d2b
font_01_sfnt_off000086ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86AE 18352 bytes
SHA-256: f5433ce3dc9930d213a8e7315569ee207b9df6dd56817c97a1fb358bc14a6a3b

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