Malicious PDF — malware analysis report

Static analysis result for SHA-256 875cf2333255a9ac…

MALICIOUS

PDF

34.1 KB Created: 2021-07-07 13:59:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0463a0909ffbbb686fbaddeb877b9837 SHA-1: 3d25d3625f0b29ef53d2dd4c9b875b1e9c1aa3d9 SHA-256: 875cf2333255a9ac264f4ff75e0042f992749806535d5be9e76958b9444182e2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links to redirectors and download sites, masquerading as game hacks and generators. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' specifically identifies links to 'free generator / game hack' sites, and the ML classifier strongly indicates maliciousness. The primary IOC is the redirector URL which likely serves a secondary payload.

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.tw/app/479516143/download-minecraft-java-edition-free-game-hack In PDF document text
    • http://razredna-nastava.net/files/roblox-hack-engine-for-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/what-does-ce-stand-for-the-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-generator-2021-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-daily-spins_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/ho9w-to-hack-roblox-with-any-player_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-free-gear-cheat_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-hacks-for-star-wars-awakening_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/who-to-get-free-shadow-item-pack-free-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-esp-aimbot-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-walk-through-walls-hack_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/robux-cheat-cods_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
font_00_sfnt_off00002e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E74 22624 bytes
SHA-256: 67fb9e2a0d9171e9379b0e7c33526282812513c88deb99c35577a54b888cf86c
font_01_sfnt_off000060e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E9 18856 bytes
SHA-256: e95e0befe6b0f5e52bf26004d68c5314d9c4319229837ab9b7c393f21c81bf12

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