Malicious PDF — malware analysis report

Static analysis result for SHA-256 586e97746ede4453…

MALICIOUS

PDF

27.1 KB Created: 2021-07-05 17:13:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2b3e3fcc68266b0226d26f77fb92c3f4 SHA-1: 00459a766fb763adf67214f4813ef307dbf2a6c8 SHA-256: 586e97746ede44530a7773aefed5b98b17eefffd4e4cf49c0138df7511ecc4cd
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'. The embedded URL, http://netcdn.tw/app/431946152/earnrobux-game-hack, is associated with malicious redirector infrastructure. The document body also contains a call-to-action phrase, reinforcing the lure. While no scripts were explicitly extracted, the nature of the lure and the malicious URL suggest an attempt to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0329

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 http://netcdn.tw/app/431946152/earnrobux-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_001_off0000156b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x156B 22684 bytes
SHA-256: c9148ac0349e9cda6184881935635a28af0e21a4a54e0fb6fc2e633f5a9d1d5b
font_01_sfnt_off000047be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47BE 18552 bytes
SHA-256: 6794fc7ee49cdd0a33f98bbbc8a763353555002210e507bd98e2a39f67d6f290

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