Malicious PDF — malware analysis report

Static analysis result for SHA-256 132b5771a4de6908…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 09:46:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 45a150c53765ac62ce9be166423d2297 SHA-1: 324156eec909b7032b8281b7d1441f55eaabbe2f SHA-256: 132b5771a4de690848f27474e920d66792952ed6de71b11344ace99f3f19a46e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on what appear to be game hacks or generators. These links lead to a redirector infrastructure that ultimately points to other PDF documents, suggesting a link farm or SEO poisoning tactic to drive traffic. The ML classifier strongly indicates malicious intent, and the presence of embedded URLs and a download button lure further support this. No scripts were extracted, but the primary attack pattern involves social engineering through deceptive links.

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/479516143/how-to-get-minecraft-for-free-on-chromebook-game-hack In PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-game-free-spin_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/hacks-and-cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/free-spins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/minecraft-dungeons-download-free_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-to-get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-minecraft-server-hosting_GM479516143.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_off00003160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3160 22436 bytes
SHA-256: cd9ccda23c2bf00887b514d94957f64ae58eaa3f0d6f34adca991a9ff69ea64c
font_01_sfnt_off000062c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C3 18916 bytes
SHA-256: a6c15671334e5340958c859e9ef76faa3bd94e6af761e25462b4f2cfb72507dc

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