Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c58d555339e3545…

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 22:26:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2746358d94aeaa857acc0b8b6b72e40b SHA-1: 4be31c7bc309d7721d18c9356eb7928be4f32a05 SHA-256: 0c58d555339e3545f6dc00616c3f64c1f6dd9505edbb0efa18f40daa24e58609
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for a redirector link to a 'free generator / game hack' lure. The document body and embedded URLs reinforce this by pointing to similar scam-related content. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector is likely spearphishing attachment, leading users to click malicious links.

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/406889139/coin-master-exchange-40-free-spins-game-hack In PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/minecraft-windows-10-hack-client-2021_GM479516143.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/free-coin-spin-daily-link-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/cm-spins_GM406889139.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/free-robux-download_GM431946152.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/www-rbx-com_GM431946152.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/robux-for-kids_GM431946152.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/is-the-robux-hack-safe-2021_GM431946152.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-on-pc_GM431946152.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/2021-roblox-place-free-bricks_GM431946152.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://elearning10.man1kotalubuklinggau.sch.id/__statics/gudangsoal/files/earn-free-robux-today_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_off0000332d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x332D 22624 bytes
SHA-256: 4280882042df369ff22c9d322b7b3942d7c8bf7ab0284acd56dd38a2bfe167c5
font_01_sfnt_off000065b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B0 18784 bytes
SHA-256: a55e0405ff3bfab9d769a08cfac276b2ed12e9db12c028e86e38811cb184192a

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