Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9fbc28f8ddbae1…

MALICIOUS

PDF

36.1 KB Created: 2021-05-10 10:50:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8892d0b3b7afec3b8b182b9acfe64fed SHA-1: 3c86099a2c53b177f77c8bbee1039f6c6fbe75d5 SHA-256: 0f9fbc28f8ddbae1ee1fd328726ff92928203458f799fbae298194c10ea74bd0
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a prominent link that redirects to a 'free coin master generator game hack' lure, indicating a social engineering attempt to trick users into downloading potentially malicious content. The heuristic firings confirm the presence of malicious redirector infrastructure and a general lure for downloads. While no scripts were explicitly extracted, the nature of the lure suggests an intent to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0302

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/free-coin-master-generator-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_off00003495.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3495 25176 bytes
SHA-256: 8465133157e4a0c9be6eaad61d9e2ce4ae0ad006ed61c0fd718161504c03c90b
font_01_sfnt_off00006dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAB 17712 bytes
SHA-256: 257a612313d270105d122f3198241e5dbbd2f563e6a420601a0e3220659a58bd

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