Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e816c68fdb4f097…

MALICIOUS

PDF

43.0 KB Created: 2021-05-12 14:45:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 27e0ad58041ea26a20069cb80f8a9d8b SHA-1: d3c9a58422bb5adc16663a0d45716a81a710946c SHA-256: 7e816c68fdb4f097e2744149c34b39b26956fc01b389bb3c71dd6d729062e8ab
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/479516143/how-to-get-minecraft-windows-10-for-free-game-hack PDF link annotation
    • https://schaefer-rechtsanwaelte.com/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/coin-master-free-spin-game_GM406889139.pdfIn PDF document text
    • https://schaefer-rechtsanwaelte.com/images/bloxpage-free-robux_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_off00004d57.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D57 24812 bytes
SHA-256: 2c66e154cfda142272b91ec1ab7e380c3e95a17bedb4f8d978c149b3740fc64c
font_01_sfnt_off000084e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E2 18524 bytes
SHA-256: 9c72abd8977421c50785b44719a9a0d208cbbe36d089006de9c81bf453dbcd54

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