Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf909ad9869980a5…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 00:40:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1d2066e9fcb60d251feff4fbc08f60a8 SHA-1: f5bcb77b69cf0fe25aeccf01c15ed475013aafed SHA-256: cf909ad9869980a5d55159e28e8a6f34dd757d2568068c160fe0a3d78792e53e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to redirectors and SEO link farms, luring users with promises of game hacks and currency. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-hack-version-game-hack, which is associated with malicious activity. The document body and embedded links suggest a social engineering tactic to drive traffic to potentially malicious sites, likely for ad fraud or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/406889139/coin-master-hack-version-game-hack In PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/who-get-free-face-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/roblox-redeem-card-hack-pin_GM431946152.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/hitbox-rezise-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/cheats-for-city-arcatect-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/hack-client_GM479516143.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/free-robux-gift-card-codes-unused_GM431946152.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/recuperar-mi-cuenta-hackeada-de-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/pokemon-go-free-and-pokeball-plus_GM1094591345.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/fd-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/cheat-roblox-super-power-training-simulator-2021_GM431946152.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.iainkediri.ac.id/pasca/repository/how-to-get-free-robux-website_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
font_00_sfnt_off00003313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3313 22892 bytes
SHA-256: 77d87a36daa7a39305bdad8bf113d54d39b3021a972daeb722b59665cd1449bb
font_01_sfnt_off00006681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6681 18140 bytes
SHA-256: 503563be678171a85d5e5a9d7aece18bf67972ce993f3ff3d264913f79314b46

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