Malicious PDF — malware analysis report

Static analysis result for SHA-256 256b1ec3bf9d99e6…

MALICIOUS

PDF

32.0 KB Created: 2021-05-14 08:08:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0e31e1f9b1b0d7ae90581922792befbd SHA-1: 4a166a4bc195267d97b5de3c9dbb06a48b954a74 SHA-256: 256b1ec3bf9d99e6acf0d6e8eff794ab909d35c435bc2e39619ce9b3d44b0f44
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a known malicious infrastructure, specifically promoting a 'free generator / game hack'. The document body text and embedded artifacts further reinforce this lure by mentioning 'Free Robux' and a generator. This indicates a phishing or scam attempt designed to lure users to a potentially harmful website.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4169

Heuristics 3

  • 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.
  • 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-do-i-get-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_off00003377.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3377 28660 bytes
SHA-256: b1bd7ddd9e69e5d4c1c52f84a71dbf45e8179286809933004433db70aae5d84b
font_01_sfnt_off00007470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7470 2880 bytes
SHA-256: 106de1d187d148d03f5c34a802444a7e62d93662ddf359d17cd55770c6c16081

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