Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf4c0b422ef0fb7…

MALICIOUS

PDF

30.3 KB Created: 2021-07-18 22:58:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 704dbfa70289e187e06261f09f8f503b SHA-1: 3d0b9aa809969b2207654e23e85a12d11dd1d36a SHA-256: 2cf4c0b422ef0fb727a174879dd7800ced22a1c111e3f02ba75a235a8a4175be
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'free Robux generator' and includes a link to a known malicious redirector. The document body text and heuristic firings confirm the intent to trick users into visiting a malicious URL. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0573

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 http://netcdn.tw/app/431946152/how-to-get-robux-for-free-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
font_00_sfnt_off00002034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2034 22772 bytes
SHA-256: 7bc5525762abf26d8e88b059a1fa929294b7633f3485bc2de81a53381adf85c5
font_01_sfnt_off00005321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5321 18868 bytes
SHA-256: 5a8c8e86d5d4dd1cc9266912e870fa4b5beecfa6d543cb137e4a029f0406ff4b

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