Malicious PDF — malware analysis report

Static analysis result for SHA-256 86de8863a67f6177…

MALICIOUS

PDF

42.7 KB Created: 2021-05-13 16:49:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c28a57e7494aeebf9e0c4613494aa4a0 SHA-1: 09866ff5e9398dabf7a9f8a84952f9fc8c7b52bc SHA-256: 86de8863a67f6177d65252e9630dc3b32887bf3c2c9f21b0c96b02c5a502dbcb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to websites offering game hacks and cheats, such as 'Coin Master Free Spin' and 'Roblox Free Robux'. The heuristic firings confirm these links point to known malicious redirector infrastructure. The document body also contains a call-to-action phrase, reinforcing the lure. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-free-spin-whatsapp-group-game-hack In PDF document text
    • http://mohacad.hu/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/roblox-demon_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-hack-minecraft-pe_GM479516143.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_003_off00004aa1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AA1 24972 bytes
SHA-256: 4694c6d4112f18a9925be4b26e94c7355fe6542ef88134f49ae1355a185143ed
font_01_sfnt_off0000842f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x842F 18392 bytes
SHA-256: 60a6361e6fc3388894d0b11e150a687c52e9f5db442fe66c80805b9ea3a4dad4

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