Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34cf4d3725427ed…

MALICIOUS

PDF

34.2 KB Created: 2021-07-01 18:34:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bb20018a2546465afa3a43ba02247321 SHA-1: ad0c29145d560bfc1b576ceed1d6e5c48383742b SHA-256: b34cf4d3725427ed124d694b1839e3cc8e369c090a2a44278f67485b1ada8935
142 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are presented as game hacks or cheats, suggesting a lure for users to download malicious content. The ML classifier strongly indicates maliciousness, and the presence of a password archive lure heuristic further supports the intent to conceal a malicious payload. The document body itself contains a direct link to a potential payload, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.co/app/431946152/halloween-free-skins-roblox-game-hack
    • https://www.owlweb.co.uk/uploads/files/files/is-minecraft-education-edition-free_GM479516143.pdf
    • https://www.owlweb.co.uk/uploads/files/files/pokemon-go-free-spoofer_GM1094591345.pdf
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-free-spins-1-coin-master_GM406889139.pdf
    • https://www.owlweb.co.uk/uploads/files/files/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdf
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://www.owlweb.co.uk/uploads/files/files/free-roblox-promo-codes-december-2021_GM431946152.pdf
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdf
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-daily-free-spin-app_GM406889139.pdf
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-mod-version-free-download-2021_GM406889139.pdf
    • https://www.owlweb.co.uk/uploads/files/files/dungeon-quest-roblox-hack-free_GM431946152.pdf
    • https://www.owlweb.co.uk/uploads/files/files/how-to-hack-people-on-roblox_GM431946152.pdf
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-free-coins-in-mcpe-master_GM406889139.pdf
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-no-verification-or-grantor-trust_GM431946152.pdf
    • https://www.owlweb.co.uk/uploads/files/files/minecraft-free-download-windows_GM479516143.pdf
    • https://www.owlweb.co.uk/uploads/files/files/windows-7-roblox-hacks_GM431946152.pdf
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-free-hair-on-roblox_GM431946152.pdf
    • https://www.owlweb.co.uk/uploads/files/files/roblox-phantom-forces-free-robux-bot_GM431946152.pdf
    • https://www.owlweb.co.uk/uploads/files/files/ideos-para-hackear-roblox_GM431946152.pdf
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-hack-without-human-verification-2021_GM406889139.pdf
    • https://www.owlweb.co.uk/uploads/files/files/minecraft-free-download-pc_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002f4f.bin
616d58e2517def358d5ea2e6b5c1e130e04d9500b5ae2519f4c5086369c0df14
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F4F 22176 bytes
font_01_sfnt_off00006078.bin
36ee14cf1f53bbeb8cca58b7dd072d9459542005f265f1798be595f70afe196b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6078 19104 bytes