Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc66d70ab4b9fa9…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 17:48:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7173ad821da77210412745b4e28b2e7a SHA-1: 587fc46be07dded3961a21adebe457effc7241a2 SHA-256: 8fc66d70ab4b9fa9e48b327192a1b8d3e3f0c2e4121dd339e292fdaf7421e860
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed to lure users into clicking links by promising free game items and scripts. It contains a large number of external links, many of which are SEO-optimized and redirect to potentially malicious sites, indicating a link farm or redirection scheme. The ML classifier also flagged this PDF as malicious with high confidence.

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.tw/app/431946152/free-roblox-scripts-game-hack PDF link annotation
    • http://library.forda-mof.org/katalog/repository/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-800-robux_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-cards-for-free_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-get-robux-using-cheat-engine-67_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/roblox-character-free_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-tiradas-gratis-2021_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-get-more-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/cmo-puedo-hackear-roblox-en-computadora_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-cheat-on-roblox-obbys_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/how-to-get-free-robux-2021-no-surver_GM431946152.pdfIn PDF document text
    • http://library.forda-mof.org/katalog/repository/free-robux-codes_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_off000030d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30D7 22860 bytes
SHA-256: bd3d52cb6fa2c920b06f582765a90b482c00125911c828a1302666557a8de089
font_01_sfnt_off0000640e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x640E 19048 bytes
SHA-256: 3ce96fc5bc1d080f260c5a9ef32574396aa7125abe18d5be612a05c7a417d147

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