Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33e414edc126837…

MALICIOUS

PDF

42.6 KB Created: 2021-05-14 17:31:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bbb6a4fac5f2912bb7fb90759225b7b9 SHA-1: 75dbe8ad8c7f1910f8744ed2311dd04be850538c SHA-256: b33e414edc126837a06354bfa19e03c5b8d475d5f7ff41050d9f56e3580d92b3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-optimized and point to game-related offers like free Robux or Coin Master spins. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the link farm heuristic strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/free-roblox-accounts-with-robux-2021-game-hack
    • http://hardbit.cn/images/free-robux-offers_GM431946152.pdf
    • http://hardbit.cn/images/roblox-admin-hack_GM431946152.pdf
    • http://hardbit.cn/images/coin-master-free-spins-23-march-2021_GM406889139.pdf
    • http://hardbit.cn/images/roblox-robux-codes-2021_GM431946152.pdf
    • http://hardbit.cn/images/coin-master-free-coins-and-spins-link_GM406889139.pdf
    • http://hardbit.cn/images/coin-master-daily-spin-link_GM406889139.pdf
    • http://hardbit.cn/images/coin-master-game-hunters-club_GM406889139.pdf
    • http://hardbit.cn/images/best-free-spins-link-coin-master_GM406889139.pdf
    • http://hardbit.cn/images/coin-master-free-spins-hack-download_GM406889139.pdf
    • http://hardbit.cn/images/coin-master-gold-cards-free_GM406889139.pdf
    • http://hardbit.cn/images/coin-master-free-spin-link-app_GM406889139.pdf
    • http://hardbit.cn/images/bloxawards-com-earn-free-robux_GM431946152.pdf
    • http://hardbit.cn/images/minecraft-texture-packs-free-download_GM479516143.pdf
    • http://hardbit.cn/images/mangocheats-com-hack-coin-master-cheat_GM406889139.pdf
    • http://hardbit.cn/images/free-spin-coin_GM406889139.pdf
    • http://hardbit.cn/images/apps-that-give-you-free-robux_GM431946152.pdf
    • http://hardbit.cn/images/how-to-get-free-outfits-on-roblox_GM431946152.pdf
    • http://hardbit.cn/images/coin-master-free-cards-link_GM406889139.pdf
    • http://hardbit.cn/images/roblox-free-robux-generator_GM431946152.pdf
    • http://hardbit.cn/images/free-coin-master-spin-daily-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000046ec.bin
5c95580b24468b975e1e574160bc171305e4b86ac0e7b70e9f107476062ef3e5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46EC 25316 bytes
font_01_sfnt_off000081d0.bin
c054b0c192e62aa8d18573c4a3caef3c11adbf34d317da17e190ba3718f8ceb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81D0 19076 bytes

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