Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e8b7e811a98cef…

MALICIOUS

PDF

28.8 KB Created: 2021-07-19 07:59:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 27b01cbefb2b097fcb2573d67c442741 SHA-1: ef6fa7994e7319b49083845dcd6c73e7e43516ce SHA-256: a4e8b7e811a98cef46f94102313bc7d02bcd6ddf88bbfd5a89ddf08fe2fa6aab
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that are identified as malicious redirectors, specifically luring users with promises of free game hacks or generators. The document body text and heuristic firings confirm the presence of these deceptive links, which are designed to lead users to potentially harmful websites. No scripts were extracted, but the primary attack vector is the malicious redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0523

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.tw/app/479516143/minecraft-free-download-iphone-game-hack In PDF document text
    • https://selesindihome.com/ckfinder/userfiles/files/tiktok-followers-for-free_GM835599320.pdfIn 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
font_00_sfnt_off00001e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4D 21700 bytes
SHA-256: 5c3234f5258361913f6b146941fc71dc68b00235d36fdd34b13d8cee430502c2
font_01_sfnt_off00004df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DF1 18632 bytes
SHA-256: 69c9e1d53de598faa7eba3c7e7e0e0cf5fcd320a3cd8fa35101ea10459ac0f9f

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