Malicious PDF — malware analysis report

Static analysis result for SHA-256 73196e55a8b94383…

MALICIOUS

PDF

34.3 KB Created: 2021-06-27 18:09:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 567225a4abffa33fc393d88a5dd4dba7 SHA-1: 0f87fd1360cd894bb540206f5caae173f4c2f8ea SHA-256: 73196e55a8b94383081ce7a0480a6369b28dcd1a753e0395b91e6a2815f45e62
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector, disguised as "game hacks" and "generators". The document body and heuristics indicate a lure designed to entice users to click these links, likely leading to further malicious content or downloads. No scripts were extracted, but the presence of malicious links and the lure pattern strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/vermillion-roblox-hacks-game-hack In PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/free-robux-download_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/collect-robux_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/roblox-weird_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/comment-jouer-a-roblox-avec-une-manette-free_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/mod-hack-roblox_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/free-robux-with-verification_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/cheat-engine-roblox-jailbreak-speed-hack_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/pubg-uc-zing_GM1330123889.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/kachifpro_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_off00003057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3057 21940 bytes
SHA-256: ce5c1208df3e4458a81b8ae236ee897041d3f69ea1de6a0ca6019ddcc52c1812
font_01_sfnt_off000060b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B2 19168 bytes
SHA-256: 6aa6bd410087b515477c1e56e4ded0a645e8f92a9dfd8d90a527ca62ec1aff07

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