Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b71276552c7291…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 23:25:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9a1ce0a58af8fb1aa5864a7d3d5219e7 SHA-1: c14aa8cdbed3ae2b1bcb20a248fafbb15c05c578 SHA-256: a0b71276552c7291b5318d9a52456c7640c0c055230e6c5c3f8d401632d6cff9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a call-to-action phrase, strongly suggesting a phishing or malware distribution attempt. The ML classifier and PDF link farm heuristics indicate a high likelihood of malicious intent, likely to redirect users to sites offering in-game currency or cheats. No scripts were extracted, but the document's structure and embedded URLs point towards a social engineering attack.

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/406889139/coin-master-free-daily-spins-link-2021-game-hack
    • http://library.stieyapan.ac.id//repository/60-free-spins-on-coin-master_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/free-minecraft-skins-ps4_GM479516143.pdf
    • http://library.stieyapan.ac.id/repository/free-robux-websites-2021_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/free-robux-just-enter-username_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-mod-version-free-download-v344_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/hack-in-roblox-2021_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/how-to-get-free-robux-for-real_GM431946152.pdf
    • http://library.stieyapan.ac.id//repository/coin-master-official-website_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/how-to-hack-in-roblox-prison-life_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/free-girl-hair-roblox_GM431946152.pdf
    • http://library.stieyapan.ac.id//repository/instagram-coin-master-free-spins_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/free-coin-master-spins-no-human-verification_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/how-to-get-more-spins-on-coin-master_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/coin-master-ids-for-free-spins_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/free-coins-coin-master-ios_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/hack-coin-master-for-free_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/minecraft-hacks-pc_GM479516143.pdf
    • http://library.stieyapan.ac.id//repository/free-coins--spins-coin-master_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003086.bin
4f0b8b4e7c4201328991dc2a782b081b5030f24ae7268ce6f07c03bf06a7a895		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3086 22648 bytes
font_01_sfnt_off0000634f.bin
9fcdcda61f85103260e2e142676e822332f3bbd5dbf2c81b53e1d0acf8c5ea6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x634F 19168 bytes

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