Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca55c1958b84d74…

MALICIOUS

PDF

42.8 KB Created: 2021-06-03 04:02:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8bc366ad006bc5f04e4e7de8bf482650 SHA-1: 9817f9881d40d0d0ca9d38504fb19610bec73f5a SHA-256: fca55c1958b84d74989044cb30f18cc447d12d202ae01bad731f247e1613b7fb
170 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a 'GAME_HACK_REDIRECT_LURE' and a 'MALICIOUS_REDIRECTOR_LINK', both pointing to the same URL. It also displays a fake CAPTCHA to trick the user into interacting with the malicious link. The document's body text and embedded artifacts further reinforce the lure of free game hacks or generators, aiming to trick users into clicking the malicious URL.

Machine Learning

  • Nyx PDF Classifier clean score 0.0285

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/431946152/rich-free-roblox-accounts-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_004_off000039c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x39C5 29084 bytes
SHA-256: 1e2d95de85d177f04c05b76ef3ec603510748b16ee79dc7e458da4b63243153c
font_01_sfnt_off00007b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B74 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00008523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8523 18476 bytes
SHA-256: 69e1d5e5a83ed6ac699c80c427ab379f6df08c8c6cfae5eea415a35bb5866042

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