Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c0c3450da630cb…

MALICIOUS

PDF

35.4 KB Created: 2021-05-20 13:48:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8948382854290d54497373cab7f94c2e SHA-1: eec64eaf614d811a1918f39c8b318935548170be SHA-256: 85c0c3450da630cb1efaf4b8ac53a1fe8e4393e243fceb7c683f42b5c206fec6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file 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 0.9508

Heuristics 4

  • 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 https://netcdn.xyz/app/835599320/free-tiktok-followers-and-likes-no-human-verification-game-hack PDF link annotation
    • https://lib.insan-unggul.ac.id/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/completed-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://lib.insan-unggul.ac.id/repository/coin-master-rewards-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_002_off000031bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31BF 23868 bytes
SHA-256: b58ecb2503f6534f0cd42d72b30329122721aed395a168f13db1b83fdbb3c380
font_01_sfnt_off0000681b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x681B 18632 bytes
SHA-256: fd02c42fb542e66a247fec5115d686b13b1cd6b3aaf765f10d8de86f45c726a3

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