Malicious PDF — malware analysis report

Static analysis result for SHA-256 580966de069b704b…

MALICIOUS

PDF

43.4 KB Created: 2021-05-12 11:16:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c5011b993f777737e7de431b7cf754ca SHA-1: 236365516f4a5db32c13921be345f4615facf840 SHA-256: 580966de069b704b1a5da54be4e4f826cfafa80df127f64a56b22ea8a523bd94
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 0.9969

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.xyz/app/431946152/how-to-make-free-robux-game-hack PDF link annotation
    • http://perpus.polimarim.online/repository/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/spin-coin_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-roblox-codes_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/mc-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://perpus.polimarim.online/repository/coin-master-email-free-spins_GM406889139.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_003_off00004b58.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B58 25208 bytes
SHA-256: e113e4436ce19e33faee86923d07add6c287bb5ed31d73f12f368af0e2d77032
font_01_sfnt_off000085e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85E5 18772 bytes
SHA-256: bc975d0cd3d1d09474d4302e54d359df6d5266f7e81f0636855fd998b44c4aca

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