Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f764fe401b9cb8…

MALICIOUS

PDF

37.8 KB Created: 2021-05-09 16:45:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e7f5df497e4b5633d7e7ddb1c96e7f86 SHA-1: 7c3c193782bc7cd3a8910ebb7307b186eb8c6a94 SHA-256: 28f764fe401b9cb8ee2b5050e728ff261b8600ce7737e35c2bc8c38ec90955f1
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to a specific URL. The document body also contains text related to hacking and a call to action, reinforcing the lure. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/how-to-hack-pets-into-pet-simulator-on-roblox-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_off00003353.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3353 27136 bytes
SHA-256: 16a5c3aaea0a76f0a31388a2f491f5dc6295a8286ea1201487d5ff850586af69
font_01_sfnt_off000070d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70D7 18852 bytes
SHA-256: 54b1403e7e6f8190f05ff5542531b6d6ea7f21b04160d5589d8ab621909321b8

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