Malicious PDF — malware analysis report

Static analysis result for SHA-256 3816ba0aa5b074e9…

MALICIOUS

PDF

37.1 KB Created: 2021-05-13 12:42:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0e593a5891a86e9ff74f79a45a9e3e65 SHA-1: 839e70aa695d88d76ae76bfe34511acd04fad6c6 SHA-256: 3816ba0aa5b074e97569194c9366207a39e889b739518938f1ab61b9eab6094e
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 malicious redirector link, specifically disguised as a 'free generator / game hack' for Minecraft. The document body also contains a call-to-action phrase, reinforcing the lure. The embedded URL leads to known malicious infrastructure, indicating a phishing or malware distribution attempt.

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/479516143/minecraft-jar-free-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_off00003613.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3613 25964 bytes
SHA-256: 6721b1e8cd209ec45c5f51342047a7efac3d5f6de16d17a187c84c1608022e3b
font_01_sfnt_off00007189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7189 17736 bytes
SHA-256: 79a8d26c7b4d0bdcab91bfdb774fad33c03b2ac78af62cbe496150d9ab38cc45

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