Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ae86560768ffdc…

MALICIOUS

PDF

37.0 KB Created: 2021-05-14 14:38:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bd33cfbf56fd008ec585b5e440c66c0c SHA-1: b75e126d3b5415272fb385c0b9bdf385b362ee8f SHA-256: a3ae86560768ffdc54c4e8e3c6fd905ccbef36205e23615cf6957c6c3eeded8e
130 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a URL known to host malicious content. The document body and embedded artifacts suggest a lure for free Robux, a common tactic for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and the nature of the lure indicate an attempt to trick the user into navigating to a malicious site, likely to download a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier clean score 0.0313

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-army-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_off000031e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31E3 27460 bytes
SHA-256: 8baa5b5eec6f60f721266a964e7a8aea2844a7e47785c3193792b95613b9888c
font_01_sfnt_off00006ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA5 18528 bytes
SHA-256: 3fb3182e9b0518fecce2d6326c4443e9fc052433b5a2fc23416796f92e2510b3

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