Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b121f7f2eb8164…

MALICIOUS

PDF

44.4 KB Created: 2021-06-03 18:27:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a9c17e8d7a4a8f927e20a4f9f701e568 SHA-1: 158c31ac55a60f7a2058fd298ebc6e9659a0a0dc SHA-256: 35b121f7f2eb8164b6b6c37c8ce2d5c4071064882782a8c835ca1bdb5d91143c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a link farm, with the primary URL pointing to a game hack. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the nature of the links suggest a phishing or SEO spam campaign, likely intended to drive traffic to malicious sites or distribute further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/free-card-collection-in-coin-master-game-hack
    • https://www.wcauk.org/uploads/files/files/how-to-find-coin-master-free-spin-link_GM406889139.pdf
    • https://www.wcauk.org/uploads/files/files/coin-master-free-spins-that-really_GM406889139.pdf
    • https://www.wcauk.org/uploads/files/files/coin-master-free-spins-blogspot_GM406889139.pdf
    • https://www.wcauk.org/uploads/files/files/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdf
    • https://www.wcauk.org/uploads/files/files/best-way-to-get-free-robux_GM431946152.pdf
    • https://www.wcauk.org/uploads/files/files/is-roblox-free-on-nintendo-switch_GM431946152.pdf
    • https://www.wcauk.org/uploads/files/files/free-robux-no-human-verification-2021_GM431946152.pdf
    • https://www.wcauk.org/uploads/files/files/free-tiktok-followers-no-survey_GM835599320.pdf
    • https://www.wcauk.org/uploads/files/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • https://www.wcauk.org/uploads/files/files/free-robux-hack-us_GM431946152.pdf
    • https://www.wcauk.org/uploads/files/files/free-robux-sites-that-work_GM431946152.pdf
    • https://www.wcauk.org/uploads/files/files/haktuts-coin-master-free-spins_GM406889139.pdf
    • https://www.wcauk.org/uploads/files/files/300-daily-free-spins-coin-master_GM406889139.pdf
    • https://www.wcauk.org/uploads/files/files/mcpe-hack-client_GM479516143.pdf
    • https://www.wcauk.org/uploads/files/files/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdf
    • https://www.wcauk.org/uploads/files/files/op-rewards-free-robux_GM431946152.pdf
    • https://www.wcauk.org/uploads/files/files/roblox-online-free_GM431946152.pdf
    • https://www.wcauk.org/uploads/files/files/how-to-get-free-minecraft-coins_GM479516143.pdf
    • https://www.wcauk.org/uploads/files/files/free-coin-master-spins-for-today_GM406889139.pdf
    • https://www.wcauk.org/uploads/files/files/robux-hack-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050a4.bin
796d3a8884ee173b64cf9d843d71c3b298df76fee8957874fdc712870ed0ec77
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50A4 25652 bytes
font_01_sfnt_off00008c0e.bin
edc3bf59ec5464d2d6a561628fecaf1a0820252d93c85382beb4d086388a752e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0E 17960 bytes