Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3fd9570308d696…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 17:24:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2c320835c76348d1a1f6efea08e323c1 SHA-1: bc59903853044bee057f4869d4462f6d3cbd5b00 SHA-256: aa3fd9570308d696fcee4c3162c2020227873c04fd7a0e03214d5b0f89d7b337
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are structured as SEO link farms, suggesting a deceptive intent to drive traffic to potentially malicious content. The document body and extracted URLs explicitly mention game hacks and rewards, indicating a lure for users seeking such content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious attack pattern.

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 http://netcdn.tw/app/431946152/rewards-roblox-game-hack
    • https://learnwmf.org/image/data/files/coin-master-free-spins-and-coins_GM406889139.pdf
    • https://learnwmf.org/image/data/files/ilum-hacks-roblox_GM431946152.pdf
    • https://learnwmf.org/image/data/files/coin-master-free-spins-facebook_GM406889139.pdf
    • https://learnwmf.org/image/data/files/free-robux-pin-codes-paste-bin_GM431946152.pdf
    • https://learnwmf.org/image/data/files/free-robux-apk_GM431946152.pdf
    • https://learnwmf.org/image/data/files/roblox-booga-booga-hack-download-free_GM431946152.pdf
    • https://learnwmf.org/image/data/files/roblox-lumber-tycoon-2-cheats-xbox-one_GM431946152.pdf
    • https://learnwmf.org/image/data/files/coin-master-hack-tool-v1-9-download-free_GM406889139.pdf
    • https://learnwmf.org/image/data/files/coin-master-100-spin_GM406889139.pdf
    • https://learnwmf.org/image/data/files/coin-master-free-spin-codes_GM406889139.pdf
    • https://learnwmf.org/image/data/files/is-it-impossible-to-get-free-robux_GM431946152.pdf
    • https://learnwmf.org/image/data/files/minecraft-diamond-finder-hack_GM479516143.pdf
    • https://learnwmf.org/image/data/files/free-robux-not-a-scam_GM431946152.pdf
    • https://learnwmf.org/image/data/files/free-coin-master-coins_GM406889139.pdf
    • https://learnwmf.org/image/data/files/hack-coin-master-dzooka_GM406889139.pdf
    • https://learnwmf.org/image/data/files/free-robux-inspect-no-waiting_GM431946152.pdf
    • https://learnwmf.org/image/data/files/coin-master-spin-link-today-free_GM406889139.pdf
    • https://learnwmf.org/image/data/files/dantdm-com-free-account-roblox_GM431946152.pdf
    • https://learnwmf.org/image/data/files/roblox-generator-com_GM431946152.pdf
    • https://learnwmf.org/image/data/files/how-to-get-free-robux-generator_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002eb2.bin
b6aeffbe67c137b1b3ee856fc53e3d1794684078f98a226506aa58a23040b4fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB2 22524 bytes
font_01_sfnt_off00006112.bin
930d589a3fa2d10146747634a187f22f648975cc01566e9bd93cefcf36c06127
pdf-font-stream PDF embedded font (sfnt) at offset 0x6112 18824 bytes