Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8c0f87eb40a218…

MALICIOUS

PDF

42.0 KB Created: 2021-05-19 16:32:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4996f57325e9104a833a4818983c821d SHA-1: a524461d69e915635882022b886c526798dd74fb SHA-256: 4a8c0f87eb40a218cd2a5046765e88c28293b4418ca4d752e917d52db5708594
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which are disguised as legitimate resources for obtaining in-game currency or hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of such links, suggesting a phishing or scamming attempt. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the document's structure and embedded links point towards a social engineering attack.

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/431946152/how-to-hack-someone
    • http://pescatun.es/images/but-link-says-free-robux_GM431946152.pdf
    • http://pescatun.es/images/roblox-c9m_GM431946152.pdf
    • http://pescatun.es/images/games-to-get-free-robux_GM431946152.pdf
    • http://pescatun.es/images/coin-master-free-spins-link-download-hack_GM406889139.pdf
    • http://pescatun.es/images/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdf
    • http://pescatun.es/images/coin-master-free-redeem-code_GM406889139.pdf
    • http://pescatun.es/images/coin-master-level-4_GM406889139.pdf
    • http://pescatun.es/images/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdf
    • http://pescatun.es/images/roblox-apk-hack_GM431946152.pdf
    • http://pescatun.es/images/rbx-place-free-robux_GM431946152.pdf
    • http://pescatun.es/images/free-coin-master-hacks_GM406889139.pdf
    • http://pescatun.es/images/pokemon-go-free-roam_GM1094591345.pdf
    • http://pescatun.es/images/free-spins-and-coins-on-coin-master_GM406889139.pdf
    • http://pescatun.es/images/free-texture-packs-for-minecraft-pe_GM479516143.pdf
    • http://pescatun.es/images/how-do-you-get-free-robux_GM431946152.pdf
    • http://pescatun.es/images/free-coins-coin-master-link_GM406889139.pdf
    • http://pescatun.es/images/games-in-roblox-that-give-you-robux_GM431946152.pdf
    • http://pescatun.es/images/how-to-hack-in-roblox-prison-life_GM431946152.pdf
    • http://pescatun.es/images/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdf
    • http://pescatun.es/images/free-spins-coin-master-links_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004704.bin
543fee90e9bb98039be6cc6dfe739c4c11edd34a5f3bf7fd3124df50457c2af4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4704 24116 bytes
font_01_sfnt_off00007e7b.bin
0830f2bc2b032c7ad37be74462a8461862374830fa053aba1852b18e492c5f08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E7B 19316 bytes

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