Malicious PDF — malware analysis report

Static analysis result for SHA-256 74386f607d824aec…

MALICIOUS

PDF

30.2 KB Created: 2021-06-17 20:03:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f60cee687b157cd8d9a7f0bd3b748ac0 SHA-1: f2df7abe595dd1f8e1c543b19a15d2ea6410a9e5 SHA-256: 74386f607d824aece389cbdc5143f98ea31830b94a89bed398d20450f1d57dcd
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 redirector link that masquerades as a "free generator / game hack". The embedded URL, http://netcdn.co/app/406889139/free-daily-spins-coin-master-game-hack, is associated with malicious redirector infrastructure. The document body also contains explicit calls to action like 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0054

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.co/app/406889139/free-daily-spins-coin-master-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000018fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FE 21924 bytes
SHA-256: b109829fec65f038a3b03422d64f95e6eca26fe5ef79823512ffc45d337b8eff
font_01_sfnt_off00004994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4994 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00005379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5379 18596 bytes
SHA-256: 4ad8fd882529be3d23a027a1092be38fd3a881cb86878c09c64331b24aa9a906

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