Malicious PDF — malware analysis report

Static analysis result for SHA-256 78291909aaded0d6…

MALICIOUS

PDF

41.8 KB Created: 2021-05-14 10:01:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bb2678610f2c123d717eb284c878e1b0 SHA-1: 50bad59c40f05aa9e0357e2174595aa6720e5e81 SHA-256: 78291909aaded0d657c1002095f50ccdec5d1a0d0e15d8b40e6a53367d949a8b
170 Risk Score

Malware Insights

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

The PDF file contains a lure for a "free generator / game hack" which links to known malicious redirector infrastructure. It also instructs the user to copy and paste content into a command-line interface, indicating an attempt to trick the user into executing arbitrary commands. The embedded URL and the clipboard command lure suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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
  • 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/roblox-help-free-robux-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003415.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3415 35664 bytes
SHA-256: d1779b6ae7f684a99910e7ededa4526bf6c35b589137d582fd80cbdf28f90ee2
font_01_sfnt_off000082c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82C1 18264 bytes
SHA-256: 4686decc205f725eac2af31d2bb610515d085fb80a4fbb870416018a21b04127

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