Malicious PDF — malware analysis report

Static analysis result for SHA-256 07fbf5260487db56…

MALICIOUS

PDF

40.5 KB Created: 2021-05-13 11:06:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9dd977948796c96f8a36cb9a48bd5536 SHA-1: ef9ed08281ee84d5d02160f48fcf51a245963172 SHA-256: 07fbf5260487db56ee2cdb9dbb2032990ce1925a361af97e31ff1376c098e380
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious redirector. The embedded URL and document body text reinforce this lure, aiming to trick users into visiting a potentially harmful site. The document was authored by wkhtmltopdf, suggesting it was likely delivered as a spearphishing attachment.

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/coin-master-free-spins-today-new-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_off00003612.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3612 24496 bytes
SHA-256: d4e96f5f0cfa40d4e166b0ca3be6c1f47e03bdc5f3b3c17bfe49577d6364258c
font_01_sfnt_off00006e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E56 4124 bytes
SHA-256: f638292427b755dd7bf77c43889fd908fca246f613cf97d028c0485efebd01ce
font_02_sfnt_off00007c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C5B 18404 bytes
SHA-256: 18e77bbf6fe8462b755cd6d2d41f5b898be86405eb57ffa87df3bebfe1b33752

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