Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a01d03a97dce88e…

MALICIOUS

PDF

39.0 KB Created: 2021-05-11 17:07:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 438b1fdab1dd48a40a98b63b32e89831 SHA-1: 5781b4c25a0e8ab899881915edc47f6f11836082 SHA-256: 4a01d03a97dce88e632fa1b78dcdae6886643f08c6a1bac33ff08221daf63bc3
130 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to known malicious infrastructure, specifically promoting a 'game hack' lure. The document body and metadata indicate it was generated by wkhtmltopdf, suggesting it might be a crafted document rather than a typical office macro-based threat. The presence of multiple malicious redirector links strongly suggests an attempt to lead the user to a malicious site for further exploitation or credential harvesting.

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-free-computer-game-game-hack In PDF document text
    • https://playhack.in/minecraftIn 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_off000036df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36DF 31652 bytes
SHA-256: c1d6bd82f3dadab4565b6f12a0886f94c22d13a84001bfb27f1e45376679634e
font_01_sfnt_off00007788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7788 18284 bytes
SHA-256: 652d84a18e1638f498f678590eda8b7b1302fb3a862e9e0847db70e42b725810

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