Malicious PDF — malware analysis report

Static analysis result for SHA-256 01547c1a91bc99d9…

MALICIOUS

PDF

42.4 KB Created: 2021-05-13 18:38:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 631d0a7dc91d895417b9337968fbf157 SHA-1: 3966ef941d5157030b039b4ab146f7330ed2dee6 SHA-256: 01547c1a91bc99d9184a331a9fdb456cd11a50390d68e77d4ada9020437e98a6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links and a document body that promises free in-game currency, indicating a lure for users to click on malicious URLs. The heuristic firings confirm a link farm and external URI, strongly suggesting a phishing or scam attempt. No scripts were extracted, but the primary attack vector appears to be directing users to potentially malicious websites.

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/earn-free-robux-for-roblox-game-hack
    • http://armportal.co.uk/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdf
    • http://armportal.co.uk/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdf
    • http://armportal.co.uk/images/roblox-exploit-scripts_GM431946152.pdf
    • http://armportal.co.uk/images/free-spins-coin-master-2021-glitch_GM406889139.pdf
    • http://armportal.co.uk/images/coin-master-hack-version-2021_GM406889139.pdf
    • http://armportal.co.uk/images/how-to-really-hack-coin-master_GM406889139.pdf
    • http://armportal.co.uk/images/www-roblox-com-robux-free_GM431946152.pdf
    • http://armportal.co.uk/images/free-private-server-roblox_GM431946152.pdf
    • http://armportal.co.uk/images/blogspot-free-spins-coin-master_GM406889139.pdf
    • http://armportal.co.uk/images/roblox-old-avatar_GM431946152.pdf
    • http://armportal.co.uk/images/rewards-roblox-com_GM431946152.pdf
    • http://armportal.co.uk/images/coin-master-free-spins-daily-1-ga_GM406889139.pdf
    • http://armportal.co.uk/images/coin-master-hack-cheat-generator-coins-and-spins-unlimited_GM406889139.pdf
    • http://armportal.co.uk/images/coin-master-free-spins-promo-code_GM406889139.pdf
    • http://armportal.co.uk/images/free-minecraft-mods_GM479516143.pdf
    • http://armportal.co.uk/images/roblox-hack-2021_GM431946152.pdf
    • http://armportal.co.uk/images/coin-master-free-coins-and-spins_GM406889139.pdf
    • http://armportal.co.uk/images/how-to-hack-a-roblox-account-easy_GM431946152.pdf
    • http://armportal.co.uk/images/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdf
    • http://armportal.co.uk/images/how-to-get-free-robux-fast_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049cd.bin
e2e389ca3b09645e44e90ca054cb5d83c8988dc541694fa845bbd2dddbcec437
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49CD 25008 bytes
font_01_sfnt_off00008330.bin
81577c12f28394e63c3fe269139937f952c5f2f271c4ac7315843a65914bc4b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8330 18316 bytes