Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4d8260a3418055…

MALICIOUS

PDF

44.9 KB Created: 2021-05-14 05:55:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d2d33c2cc4a944b6f0f8b0785f8d5fd9 SHA-1: ac2796680dd591d96016cadc588d7ddd5d8cf3c9 SHA-256: ae4d8260a3418055bc9ec56527b8293a4010cac63b8131cb99465ea933d798c2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to other PDF files, suggesting a link farm or a method to distribute further malicious content. The presence of a "Free Generator" lure and a "Click here to download" call-to-action, combined with the ML classifier's high confidence score, indicates a malicious intent to trick users into downloading or accessing harmful resources. The document's structure and embedded URLs strongly suggest it is part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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-generator-game-hack
    • http://roberto-gac.org/images/free-robux-no-human-verification-2021_GM431946152.pdf
    • http://roberto-gac.org/images/blogspot-coin-master_GM406889139.pdf
    • http://roberto-gac.org/images/minecraft-pc-download-free-full-version_GM479516143.pdf
    • http://roberto-gac.org/images/coin-master-free-spins-link_GM406889139.pdf
    • http://roberto-gac.org/images/hackear-coin-master_GM406889139.pdf
    • http://roberto-gac.org/images/how-do-you-get-free-roblox_GM431946152.pdf
    • http://roberto-gac.org/images/spins-for-coin-master_GM406889139.pdf
    • http://roberto-gac.org/images/coin-master-hack-apk-july-2021_GM406889139.pdf
    • http://roberto-gac.org/images/can-you-get-robux-for-free_GM431946152.pdf
    • http://roberto-gac.org/images/free-spin-link-coin-master_GM406889139.pdf
    • http://roberto-gac.org/images/roblox-free-robux-com_GM431946152.pdf
    • http://roberto-gac.org/images/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdf
    • http://roberto-gac.org/images/coin-master-hack-lost-world-2021_GM406889139.pdf
    • http://roberto-gac.org/images/free-links-coin-master_GM406889139.pdf
    • http://roberto-gac.org/images/free-game-pack-coin-master_GM406889139.pdf
    • http://roberto-gac.org/images/coin-master-free-spins-link-2021-download_GM406889139.pdf
    • http://roberto-gac.org/images/free-spins-for-coin-master-that-work_GM406889139.pdf
    • http://roberto-gac.org/images/minecraft-ore-finder-mod_GM479516143.pdf
    • http://roberto-gac.org/images/free-avatar-roblox_GM431946152.pdf
    • http://roberto-gac.org/images/coin-master-hacks-for-gold-cards_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b32.bin
5f81c1834a31d6235b2a76c354b92531eaa39db62392828d79e3d36513c59a75
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B32 25528 bytes
font_01_sfnt_off0000841c.bin
eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
pdf-font-stream PDF embedded font (sfnt) at offset 0x841C 2940 bytes
font_02_sfnt_off00008e2c.bin
3a905730409273d870ff573b7baf28e8fde68c17f4b305340d785871e619a609
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2C 17840 bytes