Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b50d312d23ffdc8…

MALICIOUS

PDF

40.0 KB Created: 2021-05-18 05:47:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 82f67e7ad8b2544df440624243939286 SHA-1: e2412b77bfe6b01ec6c623cc05c21a06bd04a4d2 SHA-256: 2b50d312d23ffdc81285eb47a00956195c8dde5754e0002fe2a572537e5aa307
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting a 'free generator / game hack'. The document body also contains explicit calls to action like 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', reinforcing the lure. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt designed to lead users to a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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/blogspot-coin-master-free-spins-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
stream_003_off0000347f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x347F 25280 bytes
SHA-256: f751968ecd9a3f2f22b2a7480a59c4dc5b95c208302b5602f2e41b756437255a
font_01_sfnt_off00006c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C15 4076 bytes
SHA-256: 056a5d9fc6696c1419ca085a1b223a05be7e089cf80487f6fde974bf63989bd7
font_02_sfnt_off00007a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5A 18464 bytes
SHA-256: af5d8a2e7c6ce5c46c231007036c3c30da92f088fd5d2b237af1a5c438451922

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