Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a38817929e8b1c7…

MALICIOUS

PDF

37.6 KB Created: 2021-05-17 08:31:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 05d88a79f81c584d1ecf9554a27959eb SHA-1: 2de5a081db81510be72af7803e9aae17d957de72 SHA-256: 7a38817929e8b1c73e1466c4c875de0c786b7773e14ae259389ac98293014bec
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising a 'game hack' to obtain Robux. The document body and heuristics confirm the intent is to lure the user to this URL, likely to download a secondary malicious payload. The presence of a download button lure further supports this malicious workflow.

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-to-get-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_off0000351e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x351E 25632 bytes
SHA-256: 63db42542f1fe03599a5dc5fecdf3db632186f67dfba7eab8031722f6dc1599f
font_01_sfnt_off00007094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7094 18516 bytes
SHA-256: e2a97b64806b22db336191728b408e5b7179700d4ee5fd3b4b30addea2706a3c

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