Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6ed0bb4de14fb5…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 09:40:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8c92e12d53d6df006d1b28b65416c487 SHA-1: e05ba94adebdca1f40cf8e015b25c2d81e157815 SHA-256: 8c6ed0bb4de14fb53b931209af42781797a434426cf433ba7e2c1bd382688cb6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, masquerading as game hacks or free generators. The document body, though partially corrupted, includes a primary URL that likely leads to a second-stage payload. The presence of these lures and the ML classifier's high confidence indicate a malicious intent to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.
  • 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 https://netcdn.online/app/406889139/how-to-coin-master-hack-game-hack In PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-pin_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/robux-free-online_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-c9m_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-gift-hack_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-do-you-get-free-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_004_off00004ccf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CCF 29332 bytes
SHA-256: 4b5dd252772dd29ae571a49d5c6cf83ed422b36edbc9d9c0cad03d06cb8c6d2d
font_01_sfnt_off00008b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3A 17880 bytes
SHA-256: b097c0e0a508b19b294d84254edc3a7906d96ed82e768bd7a04e405a1f825274

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