Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f7ec42977f8092…

MALICIOUS

PDF

39.3 KB Created: 2021-05-16 06:24:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8a85a8d3ef5dab76f673a13d41b5f070 SHA-1: ef7dc8452db057d8460199350ba6e45cb33166a3 SHA-256: 99f7ec42977f809239bdeb936cea73db6b2747bc12e6876b518600b2ebb9b125
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that are identified as malicious redirectors, specifically pointing to a 'game hack' lure. The document body and metadata also contain references to this lure, reinforcing the social engineering aspect. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest a phishing attempt designed to lead users to malicious websites.

Machine Learning

  • Nyx PDF Classifier clean score 0.0127

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/mcpe-master-hack-unlimited-coins-latest-version-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_off00003331.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3331 25832 bytes
SHA-256: 97e50d7cd5f12675ab294ea0181ac4d01047088ffde4a12387b976c203c37606
font_01_sfnt_off00006d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1F 2820 bytes
SHA-256: 96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689
font_02_sfnt_off000076c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76C0 18720 bytes
SHA-256: 9a564b0c0a644540a66c1b1ff06b652386e2dfb1d0e582b0e17ab2c442631031

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