Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2afcaa3af4793af…

MALICIOUS

PDF

46.2 KB Created: 2021-05-13 19:04:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4fdd8349e40b2b69bef36d24f5318eda SHA-1: cf7bda4108eba50537b27e9819803518b5aa4387 SHA-256: f2afcaa3af4793af5d3c12eaa0cd7ab5603552f99c9a88f5ad3a08d7de13e794
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are structured as SEO-friendly PDF gateways, suggesting a link farm designed to drive traffic. The document body and extracted URLs indicate a lure for free virtual currency or game items, likely a phishing or malware distribution scheme. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9628

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-robux-2021-no-verification-game-hack
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/free-coins-coin-master-link_GM406889139.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/free-robux-discord-servers_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/free-spins-coin-master-links-twitter_GM406889139.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/what-games-give-you-robux_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/coin-master-free-spin-ml_GM406889139.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/free-spins-coin-master-2021_GM406889139.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-free-coins_GM406889139.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/free-roebucks-no-human-verification_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/body-roblox_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/free-robux-youtube_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-link-today_GM406889139.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/coin-master-hack-no-verification-no-signup_GM406889139.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/get-minecraft-windows-10-free_GM479516143.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/get-free-robux-without-human-verification_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/coin-master-free-coins-link-2021_GM406889139.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/master-coin-hack-game_GM406889139.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/daily-free-spins-and-coins-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cba.bin
0a6aaef03a6bba6b2d4618ef748ddf4e493ffad1f70064679dd2b1e6ebf313e5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CBA 25040 bytes
font_01_sfnt_off000085dd.bin
02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85DD 2912 bytes
font_02_sfnt_off00008fda.bin
66494d2150ad1cf2ec2ec7771a558690eaf6f54b49f1e3390ebbe78937767b49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FDA 19004 bytes

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