Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a2913e9cdbe708…

MALICIOUS

PDF

48.4 KB Created: 2021-05-16 13:34:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 749d985ed46baf3cf76273adb5e1f20e SHA-1: 7d3ea036de42c7877335da4856867a8c810a18d5 SHA-256: 91a2913e9cdbe708ecac98b53170ad192105f6c684695afeae1e2700de0d9b15
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to game-related hacks and free currency lures, suggesting a phishing or scam attempt. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely to pages designed to attract traffic or host malicious content. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/blox-supply-free-robux-game-hack
    • https://vodomery.kiev.ua:443/images/coin-master-get-free-spins_GM406889139.pdf
    • https://vodomery.kiev.ua:443/images/coin-master-2021-free-spins-link-blogspot_GM406889139.pdf
    • https://vodomery.kiev.ua:443/images/minecraft-pocket-edition-apk-free-download_GM479516143.pdf
    • https://vodomery.kiev.ua:443/images/free-coin-master-gold-cards_GM406889139.pdf
    • https://vodomery.kiev.ua:443/images/hack-roblox-players_GM431946152.pdf
    • https://vodomery.kiev.ua:443/images/coin-master-hack-2021-without-human-verification_GM406889139.pdf
    • https://vodomery.kiev.ua:443/images/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • https://vodomery.kiev.ua:443/images/how-to-hack-roblox-jailbreak_GM431946152.pdf
    • https://vodomery.kiev.ua:443/images/do-coin-master-hacks-work_GM406889139.pdf
    • https://vodomery.kiev.ua:443/images/real-free-robux-codes_GM431946152.pdf
    • https://vodomery.kiev.ua:443/images/bloxpink-free-robux_GM431946152.pdf
    • https://vodomery.kiev.ua:443/images/how-to-hack-roblox-for-robux_GM431946152.pdf
    • https://vodomery.kiev.ua:443/images/robux-no-human-verification_GM431946152.pdf
    • https://vodomery.kiev.ua:443/images/free-robux-with-no-survey_GM431946152.pdf
    • https://vodomery.kiev.ua:443/images/orewards-com-free-robux_GM431946152.pdf
    • https://vodomery.kiev.ua:443/images/free-coin-master-spins-2021_GM406889139.pdf
    • https://vodomery.kiev.ua:443/images/coin-master-jackpot-madness-hack_GM406889139.pdf
    • https://vodomery.kiev.ua:443/images/como-hackear-coin-master-iphone_GM406889139.pdf
    • https://vodomery.kiev.ua:443/images/how-to-hack-a-roblox-account-easy_GM431946152.pdf
    • https://vodomery.kiev.ua:443/images/best-free-roblox-executor_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c44.bin
4c4013a9ced662d3564e52983479b25779a994ad8fcd6b7bc07d9f8625172eb7
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C44 29380 bytes
font_01_sfnt_off00009063.bin
02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9063 2912 bytes
font_02_sfnt_off00009a60.bin
0902d75613bc39446e97d9d8a05e59c43b59cebedccbae9a4ab3fb6f34b2e91e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A60 18444 bytes