Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc15522cc62d1b8…

MALICIOUS

PDF

40.0 KB Created: 2021-05-16 15:01:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5ab65e8c1b85f30922a39ab71275e76f SHA-1: f4f6fe74d8a34ebde133c3beb7b5fd8e076a8919 SHA-256: 4bc15522cc62d1b85f3f40d6496ec155fe2b3aa033a5680eae05538cb72042c3
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a lure for "free Robux game hack". The document body also contains text related to this lure and mentions 'wkhtmltopdf', suggesting it was generated by a tool. The primary attack pattern involves tricking users into clicking a malicious link, likely to download further malware or lead them to a phishing site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

Heuristics 4

  • 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.
  • 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://wolfzscriptsIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000035bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35BC 26212 bytes
SHA-256: 8dd5135a0e4e0d651c0a5217b7b2bd67889d5c2f8ee0c1f09d2cfda9b5afbb13
font_01_sfnt_off00007127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7127 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00007ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD7 18264 bytes
SHA-256: 4686decc205f725eac2af31d2bb610515d085fb80a4fbb870416018a21b04127

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