Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0616e89d509a53e…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 01:45:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fe980aa598f9730f4653e9bd76a23781 SHA-1: 971bd9b7239ab39dfac91c6b7caa9d74ee595497 SHA-256: b0616e89d509a53e6e4f94152e066a083aec2f5b815ee0f41b58872361da132e
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are presented as game hacks or generators for popular games like Coin Master and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the primary attack pattern appears to be social engineering through deceptive lures to drive traffic to malicious or scam-related websites.

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-free-pet-food-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-roblox-card-codes-no-download_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-robux-glitch-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-roblox-sex-game-glory-hole_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/there-is-no-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-put-cheat-codes-roblox-bubble-gum_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-roblox-accounts-bugmenot_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-card-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/rbx-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-aimbot_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-roblox-premium_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_002_off00003026.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3026 23360 bytes
SHA-256: 141ffddba06161b976c5e56e5c81901672029f33e41000bb553d32d64fcd0731
font_01_sfnt_off00006517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6517 18324 bytes
SHA-256: 10ce9c6a1e11ec0ca6b3660bcfd00cfe2a094fed43490c9d06fb1f9b5d2d4740

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