Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7c0e60d74cc533…

MALICIOUS

PDF

44.9 KB Created: 2021-05-14 06:30:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0ddfbb552b5969e17d8b96624fd7c225 SHA-1: 094cabc0e13d9282c49a69ac3b0c6dec312a534f SHA-256: 7e7c0e60d74cc533fc8895454cf51c119dbf3de0031a2c3a11f283c6f6622dde
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many with SEO-like slugs, pointing to websites offering game cheats and free in-game currency. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a call-to-action button suggests a phishing or scam attempt. The document body, though partially corrupted, contains references to 'how to hack' and game-related terms, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/how-to-hack-roblox-on-mobile-game-hack
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-free-spins-link-no-verification_GM406889139.pdf
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-links-free-spins_GM406889139.pdf
    • https://vosco.vn/uploads/vosco.vn/files/free-minecraft-account-reddit_GM479516143.pdf
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-generator-without-human-verification_GM431946152.pdf
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-code-for-free-spins_GM406889139.pdf
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-that-actually-works_GM431946152.pdf
    • https://vosco.vn/uploads/vosco.vn/files/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdf
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-hack-spins-free_GM406889139.pdf
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-free-spins-ios-2021_GM406889139.pdf
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdf
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-free-spins-11-01-2021_GM406889139.pdf
    • https://vosco.vn/uploads/vosco.vn/files/clean-master-hack-coins_GM406889139.pdf
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-free-daily-spins-link-2021_GM406889139.pdf
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-spin-link-today_GM406889139.pdf
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-hacks-for-android_GM406889139.pdf
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-free-spins-link-cheat_GM406889139.pdf
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-no-verification-at-all_GM431946152.pdf
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-no-generator_GM431946152.pdf
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-hack-mod-apk-android-1_GM406889139.pdf
    • https://vosco.vn/uploads/vosco.vn/files/how-do-you-install-minecraft-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c79.bin
fcacbc8d46c39ceb705e6af0ecdde430dd4763b0418f76d1018192e8430da0af
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C79 27608 bytes
font_01_sfnt_off00008c26.bin
cfa1ee913d083643ff52c211c3740090c9e62a3c87f75aa46b5fb7e4e02a93ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C26 18660 bytes