Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2d1c3f231225bb…

MALICIOUS

PDF

35.4 KB Created: 2021-06-26 02:07:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b7e58cc03f4996e7c7093b4d02afc90c SHA-1: 59d20b6611616eeba16d07c5f4dd14482b1b35ee SHA-256: 8a2d1c3f231225bb54d26b33d5a15b34b7c97bd5a765000742a6956cb2402111
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links disguised as game hacks and generators, a common lure for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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.co/app/431946152/roblox-free-mods-game-hack PDF link annotation
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/is-it-possible-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/bloxburg-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/roblox-jailbreak-hack-pay_GM431946152.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/fps-free-games-best-on-roblox-2021-easter_GM431946152.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/free-robux-codes-that-work_GM431946152.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/cbro-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/how-to-make-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/how-can-i-hack-money-in-roblox_GM431946152.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/ninja-legends-roblox-script-hack-novembre-decembre-2021_GM431946152.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/roblox-lego-hack_GM431946152.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-laptop-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/freer-tiktok_GM835599320.pdfIn PDF document text
    • http://elearning-man2kotabogor.sch.id/__statics/gudangsoal/files/roblox-mod-apk-unlimited-robux-hack_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_off0000336c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x336C 22656 bytes
SHA-256: 1a00d3faf58dda847d3d708b996f78bb4101c5a0796ef309ba7b889b8a5fe28d
font_01_sfnt_off000065a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65A1 19020 bytes
SHA-256: 1b598ccfeb588c2751fdfa1bda46444779bdb133af401acc35bca94fed5912af

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