Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a4dcc3eb84af09…

MALICIOUS

PDF

47.0 KB Created: 2021-06-09 05:23:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3e56d2d6df1722eeacc5289e21394552 SHA-1: c9fece7a8e453c39c81ba627d82571a928c67585 SHA-256: 55a4dcc3eb84af09e21206025fb830ba24ffc5bd7164a7c163f59f7c8cbf38cb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 or scam-related content. The document body and extracted URLs indicate a lure related to 'free Robux' and 'Coin Master' spins, likely a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/game-api-free-robux-game-hack
    • http://digilibfisip.unla.ac.id/repository/daily-free-spins-coin-master-heaven_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/free-spins-coin-master_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdf
    • http://digilibfisip.unla.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/how-to-get-free-premium-roblox_GM431946152.pdf
    • http://digilibfisip.unla.ac.id/repository/coin-master-hack-apk-2021-ios_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/coin-master-free-spins-1-coin-master_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/coin-master-free-spins-usa-2021_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/free-roblox-outfits-for-avatar_GM431946152.pdf
    • http://digilibfisip.unla.ac.id/repository/free-spins-coin-master-no-verification_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/how-to-hack-roblox-2021_GM431946152.pdf
    • http://digilibfisip.unla.ac.id/repository/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/roblox-robux-hack-generator_GM431946152.pdf
    • http://digilibfisip.unla.ac.id/repository/oprewards-com-login_GM431946152.pdf
    • http://digilibfisip.unla.ac.id/repository/smart-lodhi-coin-master-hack_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdf
    • http://digilibfisip.unla.ac.id/repository/roblox-hack-apk_GM431946152.pdf
    • http://digilibfisip.unla.ac.id/repository/how-to-hack-coin-master-2021_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/coin-master-free-spin-and-coin_GM406889139.pdf
    • http://digilibfisip.unla.ac.id/repository/how-many-levels-in-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005218.bin
26d5f825f4fab5063e5733f32fa953aba3525471974cfa5b3299714db7ac86bb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5218 28940 bytes
font_01_sfnt_off000093da.bin
4992eaa13f91c0d691d244115bcf47663110d9b037b00048971b099ce883aba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93DA 18796 bytes

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