Malicious PDF — malware analysis report

Static analysis result for SHA-256 00fd420bb14f93e4…

MALICIOUS

PDF

33.9 KB Created: 2021-07-06 11:44:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d0620b6d6e3c71f5b4f891d854d3cf67 SHA-1: 13523a8407ace8aac202592df358e720e5d33344 SHA-256: 00fd420bb14f93e4c9e3ec53abc2f7c7e5c76fecb5409f80f8e9cf10d6b3336a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. 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 0.9980

Heuristics 5

  • 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.
  • 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 http://netcdn.tw/app/406889139/game-hunters-coin-master-game-hack PDF link annotation
    • http://lib.uho.ac.id/library/repository/how-to-get-robux-in-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/tiktok-free-view-iphone-apps_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-coins-on-tiktok_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/rbx-hut-promo-codes_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/cone-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-your-friends-account-on-roblox_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_002_off00003049.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3049 22400 bytes
SHA-256: 786aaa1aa5260ee6dc3c59fca9a3d723d3667038f9e4d86c2bee22d270da5a8a
font_01_sfnt_off000061fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61FA 18236 bytes
SHA-256: 1c9276275f01b8ee8a35d94754bfc2cd49d6bf50d60c60048a77e6e66c35f9e8

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