Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af1834c9a92e620…

MALICIOUS

PDF

36.6 KB Created: 2021-05-17 17:06:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 68ce6152e765b2db3a7b8e28b7b7317b SHA-1: 1184765063aa8016d6b6182a502cd5ac565cf544 SHA-256: 7af1834c9a92e620b8b662df6673b4d962d98bd46404d856aed656470712f593
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a malicious URL, masquerading as a 'free Robux generator' or 'game hack'. The heuristic firings indicate the document is designed to lure users into clicking these links, likely to download a second-stage payload. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent for initial compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

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/free-robux-instantly-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_off000031f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F5 25196 bytes
SHA-256: b3437c2c74b5e510e4d66b921e50cea00143f2c97bbee632d6dc1620cf4e5955
font_01_sfnt_off00006cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBD 18600 bytes
SHA-256: eeb00711cf2e5591db958639ea5d908a8ba1b5c4404aa75c69e8a5349c023cb9

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