Malicious PDF — malware analysis report

Static analysis result for SHA-256 a336fbb899a42068…

MALICIOUS

PDF

44.1 KB Created: 2021-06-08 16:13:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 29a3571c25d6bbcf440452b9e26fdbf7 SHA-1: 8b7dad1599aa47ea90354c4ea775d30363e38165 SHA-256: a336fbb899a420688480d0c52c487691782fbe382b62bf0c47fdfc74c1999555
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a PDF link farm, suggesting a SEO spam or content redirection tactic. The document body and extracted URLs relate to game hacks and free items, indicating a lure for users interested in such topics. While no scripts were explicitly extracted, the presence of embedded URIs and the ML classification strongly suggest malicious intent, likely to drive traffic to malicious sites or download further payloads.

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.tw/app/431946152/how-to-bring-ak-to-roblox-school-hack-game-hack
    • http://www.dciprotection.ca/images/games-that-give-free-robux_GM431946152.pdf
    • http://www.dciprotection.ca/images/free-robux-without-human-verification_GM431946152.pdf
    • http://www.dciprotection.ca/images/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdf
    • http://www.dciprotection.ca/images/hacks-and-cheats-for-coin-master_GM406889139.pdf
    • http://www.dciprotection.ca/images/hackear-coin-master-sin-root_GM406889139.pdf
    • http://www.dciprotection.ca/images/coin-master-hacking-news_GM406889139.pdf
    • http://www.dciprotection.ca/images/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • http://www.dciprotection.ca/images/how-to-hack-coin-master-ios_GM406889139.pdf
    • http://www.dciprotection.ca/images/minecraft-free-unblocked_GM479516143.pdf
    • http://www.dciprotection.ca/images/free-spins-coin-master-october-13-2021_GM406889139.pdf
    • http://www.dciprotection.ca/images/freerobuxhack-us_GM431946152.pdf
    • http://www.dciprotection.ca/images/hacked-shirts-roblox-2021_GM431946152.pdf
    • http://www.dciprotection.ca/images/minecraft-windows-10-free_GM479516143.pdf
    • http://www.dciprotection.ca/images/coin-master-money-hack_GM406889139.pdf
    • http://www.dciprotection.ca/images/pokemon-go-free-move_GM1094591345.pdf
    • http://www.dciprotection.ca/images/free-robux-glitch_GM431946152.pdf
    • http://www.dciprotection.ca/images/como-hack-coin-master_GM406889139.pdf
    • http://www.dciprotection.ca/images/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdf
    • http://www.dciprotection.ca/images/coin-master-daily-free-spins-blog_GM406889139.pdf
    • http://www.dciprotection.ca/images/update-coin-master-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f35.bin
3007aa3d8a430624ddb786a784bda201e9f447be35a701de1c8b84b522301590
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F35 25404 bytes
font_01_sfnt_off000087dc.bin
358331cfa8840a442ccf18a5441bf273a84bdfd65edd2618ae0b70e87b3b9002
pdf-font-stream PDF embedded font (sfnt) at offset 0x87DC 18920 bytes