Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91a6051f8d9ffa3…

MALICIOUS

PDF

45.5 KB Created: 2021-06-02 10:37:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 898fd9b451bcb10df5f410db6fdd8410 SHA-1: f5376d2901d61b99d505b46f969452f584c174c0 SHA-256: a91a6051f8d9ffa34d343776094cb02f7c05452f14dc1f96d5a58cb488c71578
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a link farm, suggesting it is designed to redirect users to malicious websites. The ML classifier and PDF heuristics indicate a high likelihood of malicious intent, likely to deliver a second-stage payload or phish for credentials. No scripts were extracted, but the presence of external links and the document's deceptive content point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/431946152/2021-free-robux-windows-8.1-game-hack PDF link annotation
    • http://aviaprofsoyuz.info/images/coin-spin_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/pubg-uc-ykleme-bedava_GM1330123889.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/is-roblox-hacked_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-levels_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000500b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x500B 25772 bytes
SHA-256: 5f4370cac8ece46112e391037f79c627d1294b511e6a3e0cfea6e45d7e11c187
font_01_sfnt_off00008bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD0 19348 bytes
SHA-256: f083835171e324dee566586b56ae20805431c0f3b2e7166a17f9b6c9ea7dbab7

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