Malicious PDF — malware analysis report

Static analysis result for SHA-256 780944dfd9378c73…

MALICIOUS

PDF

43.4 KB Created: 2021-05-21 04:20:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1f034744ec0a65770c5ec18af2e9e8e5 SHA-1: 6be33d36172acb23329a8d519b21bdde8a996b18 SHA-256: 780944dfd9378c73e6ab5fa0e803f2cc7ba04a923b8503b9246365e97a5ebbf9
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple embedded links that redirect to a malicious URL, masquerading as a 'free generator' or 'game hack'. The document body and metadata indicate it was generated by wkhtmltopdf, and the primary heuristic firings point to malicious redirector infrastructure. The presence of a 'download button' lure further supports the malicious intent of directing users to this URL.

Machine Learning

  • Nyx PDF Classifier clean score 0.0151

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/431946152/free-robux-games-on-roblox-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_002_off00002e51.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E51 26780 bytes
SHA-256: d51ccd263236f3494d478d659a64ccc89c5d1174807481a5d2227ce6ba1af277
font_01_sfnt_off00006d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D49 8376 bytes
SHA-256: 092b7a11ef2af93d0b61b37032e6f669359ea7bc5bcb682d43a712f599a5ca39
font_02_sfnt_off00008818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8818 18576 bytes
SHA-256: 121d272924a8948b6bfdf19867642727f57edf659587de43eb46571e5003926c

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