Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ae5e1f0082b8c0…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 23:53:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e5e393c5c65b2216af6e826c07283612 SHA-1: eb16bf627c8104908ccd94d84f16c7201f3defec SHA-256: f3ae5e1f0082b8c0341a459bb1e6dcfd7b26ff90e186df63d52858010114ad87
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 0.9980

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/406889139/coin-master-daily-gifts-game-hack PDF link annotation
    • http://projectunionstreet.com/library/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-hack-co_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/how-to-copy-any-game-on-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/roblox-hack-injector-download_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/hack-catalog-roblox_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/how-to-get-robux-cards-for-free_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/free-tiktok-likes-generator_GM835599320.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/how-to-get-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://projectunionstreet.com/library/repository/master-coin-free-spin_GM406889139.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_off0000315f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x315F 22932 bytes
SHA-256: 3fab4c4c183c9e1059dc0d5be43988a3c0155ce5fc1b3f6fde4a4aa138aaf311
font_01_sfnt_off000064e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E8 18256 bytes
SHA-256: 9a57ad812e157e436bcc4047eb8b4adcab852283a97400467038476e1586e01e

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