Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bcdedd01aa19f1…

MALICIOUS

PDF

36.3 KB Created: 2021-07-01 09:33:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a165f75c4ef0076594e7a4382120ac09 SHA-1: 2909993805c1874d03450cd22ed25c6537c4d3d4 SHA-256: 31bcdedd01aa19f1c66b9cd4b12c5e3a3b707c4288454e306181aab72d36b831
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous external links, many of which are hosted on domains related to game hacks and cheats, suggesting a lure for potentially unwanted software. The presence of a 'download button' heuristic further supports this, indicating a deceptive call to action. The ML classifier also flagged this PDF with high confidence, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/robux-for-free-no-downloading-apps-game-hack PDF link annotation
    • https://www.bridalguide.com/sites/default/files/files/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/roblox-popular-hacker_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-access-the-studio-of-a-roblox-game-hack_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-get-free-skinss-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-get-roebucks_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/armored-patrol-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-robux-picture_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-free-pet-snacks_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/roblox-cheat-engine-hacks-jailbreak_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3372 23028 bytes
SHA-256: ad6f048cba230e5c894d8402e225943f22743ae938fccded535aeac102287280
font_01_sfnt_off00006726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6726 19592 bytes
SHA-256: 2641af60dae36da1b9989c2a5bb56e150df4d14470c2de7fa0861588d8d9b761

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