Malicious PDF — malware analysis report

Static analysis result for SHA-256 8419d7fefecb34c2…

MALICIOUS

PDF

33.6 KB Created: 2021-06-19 19:11:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 863a2bdbf40e7bdfa47bd5f70c1d98c4 SHA-1: 16110adbed0d1ad9cb7bdd8c4923ef977f01d9c8 SHA-256: 8419d7fefecb34c21d47fd11199cb40ac55376fccf3f3b5269d2895c8e1d144b
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.co/app/431946152/hack-des-robux-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-bee-swarm-simulator-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/pubg-75-uc_GM1330123889.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/asshat-level-7-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-r-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-on-roblox-2021-fast_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-gift-card-codes-800-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-level-6-exploits-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/real-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-by-roblox-astebin_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/robux-in_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-free-spins-and-coins-daily_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
font_00_sfnt_off00002d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D6B 22260 bytes
SHA-256: 9c8b389ea1178f9b0671ef3f25b4375657aadbb2bad7bc3abbe94230d9b94c89
font_01_sfnt_off00005e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7A 18888 bytes
SHA-256: c219ac9f4b0a575333ba7d99127efef4d712ca6399b2fe9f681dae8cadfa681a

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