Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e82a117f78c39b…

MALICIOUS

PDF

43.0 KB Created: 2021-05-16 05:01:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 61679615b8d6e79042abf212d5a2eb6b SHA-1: bf2f3b75c1fa0fb9bd483f2cc6bc8d1702fda16f SHA-256: 31e82a117f78c39b96054a6453162d7bda10007f1f94f6e327a28df6f4a3ad29
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF slugs, suggesting a link farm or content aggregation for malicious purposes. The presence of a download button lure and callback lure heuristics, combined with the ML classifier's high confidence, indicates a malicious intent to direct users to potentially harmful content or phishing pages. No scripts were extracted, but the document's structure and embedded URLs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/479516143/minecraft-multiplayer-free-game-hack
    • http://lamascheradiferro.dk/images/free-robux-that-actually-works-2021_GM431946152.pdf
    • http://lamascheradiferro.dk/images/free-robux-no-human-verification-generator_GM431946152.pdf
    • http://lamascheradiferro.dk/images/free-coin-master-spins_GM406889139.pdf
    • http://lamascheradiferro.dk/images/robux-games_GM431946152.pdf
    • http://lamascheradiferro.dk/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://lamascheradiferro.dk/images/coin-master-free-spins-hack-iphone_GM406889139.pdf
    • http://lamascheradiferro.dk/images/minecraft-build-hacks_GM479516143.pdf
    • http://lamascheradiferro.dk/images/roblox-images_GM431946152.pdf
    • http://lamascheradiferro.dk/images/how-to-hack-roblox-accounts-passwords_GM431946152.pdf
    • http://lamascheradiferro.dk/images/coin-master-latest-version-hack_GM406889139.pdf
    • http://lamascheradiferro.dk/images/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdf
    • http://lamascheradiferro.dk/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdf
    • http://lamascheradiferro.dk/images/free-robux-generator-without-verification_GM431946152.pdf
    • http://lamascheradiferro.dk/images/minecraft-hacked-apk_GM479516143.pdf
    • http://lamascheradiferro.dk/images/how-to-download-minecraft-for-free-ios_GM479516143.pdf
    • http://lamascheradiferro.dk/images/how-to-get-free-robux-promo-codes_GM431946152.pdf
    • http://lamascheradiferro.dk/images/roblox-report-hacker_GM431946152.pdf
    • http://lamascheradiferro.dk/images/get-free-spins-for-coin-master_GM406889139.pdf
    • http://lamascheradiferro.dk/images/free-robux-just-enter-username-and-password_GM431946152.pdf
    • http://lamascheradiferro.dk/images/is-it-possible-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b94.bin
f708f3c91e1cba6b6acb8848aeeb024eb11ae50bea0914ce09c9947c3e03df97		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B94 26748 bytes
font_01_sfnt_off0000865d.bin
22c65de64af2721f6fc37241b86838ece151de043079d0e804f5da14bd34918b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x865D 18136 bytes

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