Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6f3e6199da3a99…

MALICIOUS

PDF

45.0 KB Created: 2021-05-15 05:30:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4528864ad8a32c39f3da7283dbfb6060 SHA-1: 669bb4b0b41d5f783a7cb6a964834a4973bc78c6 SHA-256: df6f3e6199da3a9961904c976604f05a6861b0d09bedbd6fdd14a4ffc0111700
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to websites offering cheats for popular games like Roblox and Coin Master. The ML_NYX_PDF_MALICIOUS heuristic also flagged the document with high confidence. The primary attack pattern involves luring users to click these links, which likely lead to phishing pages or further malware distribution. No scripts were extracted, but the extensive link farm suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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-get-roebucks-on-roblox-game-hack PDF link annotation
    • http://classicskitours.net/images/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://classicskitours.net/images/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • http://classicskitours.net/images/today-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://classicskitours.net/images/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://classicskitours.net/images/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://classicskitours.net/images/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://classicskitours.net/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/coin-master-hack-xyz-2021_GM406889139.pdfIn PDF document text
    • http://classicskitours.net/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://classicskitours.net/images/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
    • http://classicskitours.net/images/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://classicskitours.net/images/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004863.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4863 25324 bytes
SHA-256: 0d6ce5351a4a83a628780257a52993e0d1633e1f0aa5416bbb56a32829bc2212
font_01_sfnt_off000082f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82F8 2884 bytes
SHA-256: b13f24524958359a8e7513ef6fdac3eb68825e057314a35989b5fe5ff20957cd
font_02_sfnt_off00008ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CEB 18364 bytes
SHA-256: 2b946b4d7a1998aebf51f19e9cbc0e13d461cd82a275ed989f3ac0cfcc0a4974

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