Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5e370babed7039…

MALICIOUS

PDF

48.8 KB Created: 2021-06-09 10:32:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4893431021e1c6c7430b18a237c4e9c8 SHA-1: 24abefe4ae8de356f7126d8489d2e5538dcd0568 SHA-256: bf5e370babed70395a32dbe5c1b4dbdf20385f868cd052fb5cd03b282d7ec122
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, pointing to sites offering free in-game currency or items. The document body, though heavily obfuscated, contains text related to 'free Robux', a common lure for phishing or scam operations. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/how-do-i-get-free-robux-without-doing-anything-game-hack
    • https://learnwmf.org/image/data/files/get-coin-master-spins-free_GM406889139.pdf
    • https://learnwmf.org/image/data/files/e-free-roblox_GM431946152.pdf
    • https://learnwmf.org/image/data/files/minecraft-anarchy-server-no-hacks_GM479516143.pdf
    • https://learnwmf.org/image/data/files/coin-master-free-spin-trick_GM406889139.pdf
    • https://learnwmf.org/image/data/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdf
    • https://learnwmf.org/image/data/files/minecraft-account-hacked_GM479516143.pdf
    • https://learnwmf.org/image/data/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • https://learnwmf.org/image/data/files/master-coin-free_GM406889139.pdf
    • https://learnwmf.org/image/data/files/how-to-make-free-robux_GM431946152.pdf
    • https://learnwmf.org/image/data/files/coin-master-free-spin-and-coin-link-today_GM406889139.pdf
    • https://learnwmf.org/image/data/files/free-robux-accounts_GM431946152.pdf
    • https://learnwmf.org/image/data/files/minecraft-diamond-finder-hack_GM479516143.pdf
    • https://learnwmf.org/image/data/files/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • https://learnwmf.org/image/data/files/coin-master-32-android-mod-hack-apk-download_GM406889139.pdf
    • https://learnwmf.org/image/data/files/robux-sign_GM431946152.pdf
    • https://learnwmf.org/image/data/files/get-free-spins-coin-master-link_GM406889139.pdf
    • https://learnwmf.org/image/data/files/coin-master-free-spins-haktuts_GM406889139.pdf
    • https://learnwmf.org/image/data/files/roblox-arsenal-hack-script-money_GM431946152.pdf
    • https://learnwmf.org/image/data/files/download-coin-master-apk-hack_GM406889139.pdf
    • https://learnwmf.org/image/data/files/get-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fe5.bin
b2922a5be496018360747ee017d665eb041cf33ce0331e227cf758192af002d2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE5 27184 bytes
font_01_sfnt_off00008f0c.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F0C 2840 bytes
font_02_sfnt_off000098bd.bin
4279bf1796e0d98962865bc5d73de441ea7fd558f85a1cbef1f3e3113d85468d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98BD 19400 bytes

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