Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc29aec3583a663…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 03:00:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cf4e31e49cad85be3ab2f55b0f1c6b8a SHA-1: 975cc727fa2b853a8c76a8dc623c5f675ccb3369 SHA-256: 4cc29aec3583a663dbd1a0bcdd7817cc201e220a1525736ebdf824946b2e3b00
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to SEO-optimized links for games and hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO spamming operation. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'download button' lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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-game-free-play-online-game-hack
    • https://learnwmf.org/image/data/files/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • https://learnwmf.org/image/data/files/free-spins-coin-master-links_GM406889139.pdf
    • https://learnwmf.org/image/data/files/roblox-twisted-murderer-mvp-hack_GM431946152.pdf
    • https://learnwmf.org/image/data/files/free-robux-generator-2021_GM431946152.pdf
    • https://learnwmf.org/image/data/files/roblox-how-to-hack-robux-with-cheat-engine-64_GM431946152.pdf
    • https://learnwmf.org/image/data/files/coin-master-free-raid-link_GM406889139.pdf
    • https://learnwmf.org/image/data/files/apps-for-free-robux_GM431946152.pdf
    • https://learnwmf.org/image/data/files/free-robux-pastebin-hack_GM431946152.pdf
    • https://learnwmf.org/image/data/files/coin-master-hack-ios_GM406889139.pdf
    • https://learnwmf.org/image/data/files/robux-no-survey_GM431946152.pdf
    • https://learnwmf.org/image/data/files/roblox-arsenal-hack-script-money_GM431946152.pdf
    • https://learnwmf.org/image/data/files/how-to-make-clothes-on-roblox-for-free_GM431946152.pdf
    • https://learnwmf.org/image/data/files/coin-master-free-coins-and-spins-today_GM406889139.pdf
    • https://learnwmf.org/image/data/files/coin-master-200-spin-link_GM406889139.pdf
    • https://learnwmf.org/image/data/files/coin-master-free-spins-and-free-coins_GM406889139.pdf
    • https://learnwmf.org/image/data/files/guest-world-roblox-script-hack_GM431946152.pdf
    • https://learnwmf.org/image/data/files/coin-master-hack-xyz-2021_GM406889139.pdf
    • https://learnwmf.org/image/data/files/how-to-play-coin-master_GM406889139.pdf
    • https://learnwmf.org/image/data/files/can-you-get-robux-for-free_GM431946152.pdf
    • https://learnwmf.org/image/data/files/can-i-download-minecraft-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003259.bin
2e49e9c0170174814a2b5114a7dd928648f0b56a28cf952e9cbfd5ab8855e2bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x3259 22780 bytes
font_01_sfnt_off00006559.bin
6cf81a4836f43e6865da5e830d1e059b8f471d909c0cfb59af40a3dbe760999e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6559 18664 bytes