Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c494780dc5daa6b…

MALICIOUS

PDF

37.6 KB Created: 2021-05-16 11:32:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9b9d3a995c2156dd65c73eb42d95bcae SHA-1: ed9c5178ff5ad6676c34bd694cfc9b4ab0337dbb SHA-256: 0c494780dc5daa6b2466d853d25bd81699ede80b43aa9131163786a6f1eee36b
170 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'Roblox Robux Hack' and displays a fake CAPTCHA to trick the user into clicking a malicious link. This link, 'https://netcdn.xyz/app/431946152/roblox-robux-hack-game-hack', redirects to known malicious infrastructure. The document body also contains text related to the lure and the embedded URL.

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/roblox-robux-hack-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_off0000341b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x341B 26344 bytes
SHA-256: 4ab48d16c86a9968eaedfd08d7a24b6aaab610fcca5a4e45665dda3a0e99e054
font_01_sfnt_off000071b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B7 18320 bytes
SHA-256: fa424f86a9ddd472d540fc30f07119be4b576a9306b5f7bb82c207f2bb92a2b4