Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb546de8da27ce54…

MALICIOUS

PDF

48.6 KB Created: 2021-06-10 21:12:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3f4e6d5a398bed7e52c450088ad7eaf8 SHA-1: 2daf1cf2b6556b09710036d5d6b2babc9cdf82c3 SHA-256: cb546de8da27ce54c23d95d472c6e86dca2d27b95ecff2f0a4b9dd296604b92e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/431946152/cheat-roblox-2021-la-dernier-misajoure-game-hack PDF link annotation
    • http://librarysenior.com/repository/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-hack-android-root_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/www-cheatsk-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-34-4-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/is-roblox-hacked_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D8 25956 bytes
SHA-256: cd5abf0c21338208edac57400d080974b837dd445ccddf5bd564d8d9e7221af9
font_01_sfnt_off00008cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC0 3084 bytes
SHA-256: 4889dc98a6bfd3c9244583f92387be58625a91e7a969778ad35ada89b27ed636
font_02_sfnt_off00009766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9766 19496 bytes
SHA-256: fd666955cdbd81cf2a9d2276229b3a0baadbdfb5086dab773319374c63573652

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