Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c961460e1761b8…

MALICIOUS

PDF

43.6 KB Created: 2021-05-11 14:03:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: faea9662ad3e1ab81d959a51c7de8b75 SHA-1: ab5d686fd0846c54984ecaddb65d841d8651210a SHA-256: 23c961460e1761b8d186a6bc0654cf33095e91b275f13c2ee4669120a0e6ddab
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple external links, including one to a 'free generator / game hack' lure, and a large number of other PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/479516143/real-minecraft-for-free-game-hack PDF link annotation
    • https://learnwmf.org/image/data/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/how-can-you-get-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-hack-cheat-generator-d_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-attack-hack_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • https://learnwmf.org/image/data/files/free-unlimited-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://education.minecraftIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004923.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4923 31776 bytes
SHA-256: b43d140b7b8ce0701d4aec7234d00e4737e684dd7ee7399b29dce66bbe347d3a
font_01_sfnt_off000089dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89DC 17784 bytes
SHA-256: d9b0d0c4c4ee4a540b7fb0061982a790ffe87580883f4fb909ed1eb0697febb4

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