Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a9a1292a886116…

MALICIOUS

PDF

36.4 KB Created: 2021-05-10 11:50:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ab10b55e9c996c7409180f3f23cb7105 SHA-1: 2fcbb82d0695becd50c658c44a1de80865584d56 SHA-256: a5a9a1292a886116425dfb8a3053c26b2aa1e166d08950302ff6b1c9d85f8f70
130 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically advertising a "free generator / game hack" for Coinmaster. The embedded URL, https://netcdn.xyz/app/406889139/coinmaster-links-game-hack, is identified as malicious infrastructure. While no scripts were extracted, the document's structure and the nature of the lure suggest an attempt to direct the user to a potentially harmful site, likely for further exploitation or credential harvesting.

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/406889139/coinmaster-links-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_off0000348b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x348B 24884 bytes
SHA-256: 98ffcdd285ac14f20d00b13072bc52de783220b5f86794f8ca05f5b6daeff15d
font_01_sfnt_off00006e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0C 17976 bytes
SHA-256: a321bb876bfba90ca025b4c3027fd158f72fae1f747322c9d5199a500aa286eb

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