Malicious PDF — malware analysis report

Static analysis result for SHA-256 54dcb08cf0f2c560…

MALICIOUS

PDF

44.8 KB Created: 2021-05-19 05:51:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d1b77cfb94ef80427fc67493f19d25d1 SHA-1: 22bdc7eb4275ebf3ba71f9bf148975c4297f53ed SHA-256: 54dcb08cf0f2c560e40a71608ee8eafef02eab15755cce9f6aae543e0496445c
110 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, pointing to external PDF files. The document body and heuristics suggest a lure for free game items or hacks, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of external links suggests it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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-free-reddit-game-hack
    • http://bi-bordtennis.dk/images/free-robux-hack-2021_GM431946152.pdf
    • http://bi-bordtennis.dk/images/get-free-spins-on-coin-master-no-human-verification_GM406889139.pdf
    • http://bi-bordtennis.dk/images/coin-master-hack-version-download_GM406889139.pdf
    • http://bi-bordtennis.dk/images/vip-roblox-free_GM431946152.pdf
    • http://bi-bordtennis.dk/images/coin-master-free-spins-2021-app_GM406889139.pdf
    • http://bi-bordtennis.dk/images/free-robux-gift-card_GM431946152.pdf
    • http://bi-bordtennis.dk/images/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdf
    • http://bi-bordtennis.dk/images/how-to-get-free-premium-roblox_GM431946152.pdf
    • http://bi-bordtennis.dk/images/how-to-change-roblox-username-for-free_GM431946152.pdf
    • http://bi-bordtennis.dk/images/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdf
    • http://bi-bordtennis.dk/images/roblox-gift-card-for-free_GM431946152.pdf
    • http://bi-bordtennis.dk/images/free-robux-reddit_GM431946152.pdf
    • http://bi-bordtennis.dk/images/is-minecraft-free-on-computer_GM479516143.pdf
    • http://bi-bordtennis.dk/images/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdf
    • http://bi-bordtennis.dk/images/free-spins-on-coin-master-links-2021_GM406889139.pdf
    • http://bi-bordtennis.dk/images/free-minecraft-videos_GM479516143.pdf
    • http://bi-bordtennis.dk/images/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • http://bi-bordtennis.dk/images/coin-master-free-spins-hack-download_GM406889139.pdf
    • http://bi-bordtennis.dk/images/free-outfits-roblox_GM431946152.pdf
    • http://bi-bordtennis.dk/images/how-to-hack-roblox-jailbreak_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c7c.bin
9d26cb4ccd421bf8b5814e7280ffdf272ea6ebf795e19b0205f3e93e7157d51c
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C7C 29524 bytes
font_01_sfnt_off00008ec1.bin
f948482fd1df41cb9f23d99423963c320106fe54258b543107269e74c7833838
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC1 17744 bytes