Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b45304712349bc…

MALICIOUS

PDF

42.7 KB Created: 2021-05-14 02:54:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4812a7c36928b6530961074e6cd5906e SHA-1: 8be897d57ce4321b3d40d67d8995e33186bd5e6b SHA-256: a7b45304712349bce84cba080d3ecb9d5d96e894b88eea2cc741d71f0c6ae29d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a primary URL that lead to other PDF files, many of which are hosted on suspicious domains and promise game cheats or currency. This behavior is indicative of a link farm designed to distribute potentially malicious content, likely as part of a phishing or scam campaign. The ML classifier also strongly flagged this PDF as malicious.

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-get-a-lot-of-robux-game-hack PDF link annotation
    • http://sudamericarural.org/images/rbx-roblox_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/roblox-games-free_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://sudamericarural.org/images/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://sudamericarural.org/images/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sudamericarural.org/images/free-roblox-followers-generator-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
stream_003_off00004aed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AED 25048 bytes
SHA-256: 7dd0b50fef8a1993ab7590576464777f20aa5d018a637a9f116e9af8a3a4847f
font_01_sfnt_off000084be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84BE 18120 bytes
SHA-256: 042a1857860dc696e0dbe9c9f325bf17f11d6ec89e659ed0d278e4175a2693af

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