Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe223c799abeb6a…

MALICIOUS

PDF

46.3 KB Created: 2021-06-11 01:43:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a8c911fea1d26df8c12cfef7c2cb4bd2 SHA-1: 2a84822e47303980421a9dc720ec05cfdd31cfdd SHA-256: cfe223c799abeb6ac795e69ac39d81d131047e2773a621464b7b3a76cd31a2f9
180 Risk Score

Malware Insights

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

The PDF document employs a lure related to game hacks and generators, directing users to a known malicious redirector URL. This suggests an attempt to deliver a second-stage payload or lead the user to a phishing site. The presence of multiple redirector links and the ML classifier's high confidence score reinforce the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://netcdn.tw/app/431946152/cheat-roblox-ro-ghoul-en-francais-game-hack In PDF document text
    • http://gomelavto.by/images/minecraft-free_GM479516143.pdfIn PDF document text
    • http://gomelavto.by/images/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/how-to-hack-peoples-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/free-spins-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/how-to-make-your-own-shirt-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/hacks-for-roblox-pc_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://gomelavto.by/images/free-robux-with-copy-and-past_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/how-to-get-free-robux-not-downloads_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://gomelavto.by/images/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://gomelavto.by/images/free-robux-come_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_004_off000052e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E9 27140 bytes
SHA-256: ef07896be5c493941fa892148b88593e2a7490433488429820104d8d7c201bc8
font_01_sfnt_off0000906d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x906D 19028 bytes
SHA-256: 6837180471579b917e36fd4aaf76b9a8069966781448c2ef03d15c9503d1618a

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