Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9a7d1f60d65b24…

MALICIOUS

PDF

42.5 KB Created: 2021-05-13 19:30:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 73bb06fa8a197fc69e456e05f2064f03 SHA-1: 80d06fbb9b543be09357775165b982898acc83e5 SHA-256: 2c9a7d1f60d65b24a257a44fb9038a735b9c8ddb29aeef6522bd2b948d1a0af5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. 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 0.9971

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 https://netcdn.xyz/app/406889139/free-spin-coin-master-2021-game-hack PDF link annotation
    • http://kishplus.ir/images/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/no-robux_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
    • http://kishplus.ir/images/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://kishplus.ir/images/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://kishplus.ir/images/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://kishplus.ir/images/coin-master-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://kishplus.ir/images/coin-master-free-spin-game_GM406889139.pdfIn PDF document text
    • http://kishplus.ir/images/hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • http://kishplus.ir/images/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://kishplus.ir/images/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://kishplus.ir/images/cute-free-roblox-outfits_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_003_off0000468e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x468E 29016 bytes
SHA-256: 233c106454acd574764051d801b377d71be0169c200e6fc82e5d425bdc8ba0fc
font_01_sfnt_off0000837c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x837C 18288 bytes
SHA-256: fd0044dd07fea29fabb02cccaad095bc879ba68536b4dede47c40461e88c70e2

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