Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b62a3db31d6b3e3…

MALICIOUS

PDF

45.5 KB Created: 2021-06-03 22:00:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e43ec7ca335d829e8dca92050cb5c235 SHA-1: 721e0fb40f7c51a662e600afbb5e82451c95e9da SHA-256: 4b62a3db31d6b3e335d71769c9dc15a4a66397acd3a9130ace14ffd530af9e23
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links and a call-to-action phrase, strongly suggesting a phishing or scam attempt. The document body and extracted URLs point to lures for free in-game currency or items, indicating a social engineering tactic to drive users to malicious sites. The presence of a large number of external PDF links further supports a link farm or SEO poisoning strategy to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/431946152/roblox-free-robux-codes-game-hack
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/legit-free-spins-coin-master_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/free-robux-generator-no-verification_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-without-offers_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/free-spins-on-coin-master-2021_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/free-roblox-shirt-templates-2021_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/roblox-hack-2021_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/free-robux-websites-that-actually-work-2021_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/como-hack-coin-master_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/minecraft-windows-10-free-trial_GM479516143.pdf
    • http://www.js100.com/uploads/ckeditor/files/free-robux-hack_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/roblox-studio-free-download_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/hacks-for-minecraft-bedrock_GM479516143.pdf
    • http://www.js100.com/uploads/ckeditor/files/cm-spins_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/free-robux-no-generator_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/minecraft-pocket-edition-mods-for-free_GM479516143.pdf
    • http://www.js100.com/uploads/ckeditor/files/free-robux-websites-that-actually-work_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054ed.bin
6e4ac718b0872ac2e368be88bbbe8a2f1709ac98c88424af02902ca4b13443ca
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54ED 25108 bytes
font_01_sfnt_off00008f4b.bin
40a15a9049e9412bdd5c9a35f1903570ad5947e976b8939b833c9d7797e77bf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4B 18260 bytes