Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e9eec6a24ff72b…

MALICIOUS

PDF

41.6 KB Created: 2021-05-14 19:03:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cdf89d717dea0a01ac65ec654625f30a SHA-1: d53c84dd3e571285ddfca0726391c1206368aecb SHA-256: 28e9eec6a24ff72bfd104cc42ad42782830d5125991db97dd1695a1426642464
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are SEO-farmed to appear as legitimate game-related downloads or hacks. The ML classifier strongly indicates maliciousness, and the embedded URLs point to suspicious domains likely hosting malware or phishing content. The document body itself is heavily obfuscated but contains references to game hacks and download URLs.

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/406889139/coin-mast-hacks-game-hack
    • http://www.siahotel.com/userfiles/files/roblox-hack-game_GM431946152.pdf
    • http://www.siahotel.com/userfiles/files/moon-static-coin-master-generator-hacks-free_GM406889139.pdf
    • http://www.siahotel.com/userfiles/files/how-to-get-free-robux-no-verification-2021_GM431946152.pdf
    • http://www.siahotel.com/userfiles/files/free-spins-and-coins-on-coin-master_GM406889139.pdf
    • http://www.siahotel.com/userfiles/files/free-robux-thumbnail_GM431946152.pdf
    • http://www.siahotel.com/userfiles/files/google-coin-master-free-spins_GM406889139.pdf
    • http://www.siahotel.com/userfiles/files/gold-cards-coin-master-hack_GM406889139.pdf
    • http://www.siahotel.com/userfiles/files/free-pet-food-on-coin-master_GM406889139.pdf
    • http://www.siahotel.com/userfiles/files/how-to-hack-roblox-accounts-passwords_GM431946152.pdf
    • http://www.siahotel.com/userfiles/files/free-robux-survey_GM431946152.pdf
    • http://www.siahotel.com/userfiles/files/se-puede-hackear-coin-master_GM406889139.pdf
    • http://www.siahotel.com/userfiles/files/blogspot-coin-master_GM406889139.pdf
    • http://www.siahotel.com/userfiles/files/roblox-survey-for-robux_GM431946152.pdf
    • http://www.siahotel.com/userfiles/files/coin-master-free-spins-hack_GM406889139.pdf
    • http://www.siahotel.com/userfiles/files/toolbox-apk_GM479516143.pdf
    • http://www.siahotel.com/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://www.siahotel.com/userfiles/files/free-roblox-avatar_GM431946152.pdf
    • http://www.siahotel.com/userfiles/files/coin-master-hack-no-verification-ios_GM406889139.pdf
    • http://www.siahotel.com/userfiles/files/coin-master-daily-free-spin-and-coin_GM406889139.pdf
    • http://www.siahotel.com/userfiles/files/free-robux-on-iphone_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000478d.bin
eaf403f7dd42ad3890fcb6b4b6608fdbc013e2171d6c274c1289aff8bc4a2534
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x478D 25880 bytes
font_01_sfnt_off000081a7.bin
777b684355b1eef5a972c4758674727e521bcb83e374608eb379fd1ca070469a
pdf-font-stream PDF embedded font (sfnt) at offset 0x81A7 17716 bytes