Malicious PDF — malware analysis report

Static analysis result for SHA-256 a310d71fb53586fc…

MALICIOUS

PDF

37.9 KB Created: 2021-05-16 10:01:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d4ce13f38c34fa54b68e503d86d09c87 SHA-1: ae29595f588b39d003f24667cdd874b303edb5d9 SHA-256: a310d71fb53586fc674b742e15cb7c22677b189fb9713043e9fe64d0696b16a9
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'game hack' lure. This link is embedded within the document's text and is presented alongside a visual 'download button' lure. The document's authoring application, wkhtmltopdf, and the presence of embedded fonts suggest it was programmatically generated, likely to host the malicious link.

Machine Learning

  • Nyx PDF Classifier clean score 0.0126

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/static-moonactive-net-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_off00003383.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3383 24368 bytes
SHA-256: b4ac87ad9998d98e233733355d2ec817e00989cd6381418b91328067cd9ea556
font_01_sfnt_off00006aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAB 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off0000744d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x744D 17660 bytes
SHA-256: 6b7ab008261f630dc22e15b5ef3c221448b4794aa8c3d363ebd414377ccf7e51

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