Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04a4ab31a41dbe2…

MALICIOUS

PDF

37.3 KB Created: 2021-05-14 11:01:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 09a0496852e57bf914ffb015ff084ffa SHA-1: 90e755a6564f8cdc0bec7891677791a2a3c3c2bd SHA-256: b04a4ab31a41dbe25483f84abb892440db2d626233e52d6cea9ec70dad5ac4c4
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple heuristics indicating malicious intent, including links to a known malicious redirector and a fake CAPTCHA lure. The primary URL, 'https://netcdn.xyz/app/431946152/how-to-get-free-robux-hack-2021-game-hack', is associated with a game hack generator, a common social engineering tactic. The document body and embedded artifacts suggest the intent is to trick the user into clicking the malicious link, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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.xyz/app/431946152/how-to-get-free-robux-hack-2021-game-hack In 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
stream_003_off00003063.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3063 27112 bytes
SHA-256: db7084627969002b2db484436c552959af9279b791716564b6c7d9515a0487dc
font_01_sfnt_off00006e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E12 19084 bytes
SHA-256: bf126c80224e4ece1a877f3c45a4e2f725662c205f8b78a709aa4c80730d283c

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