Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6f462303c626d6…

MALICIOUS

PDF

29.3 KB Created: 2021-05-13 03:37:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: bd7095dde32748e851ee522a0b8133d7 SHA-1: 8bad51eb2f917758b77040b5c2166c5dadc64e2e SHA-256: 2f6f462303c626d6bb1a0551e0c3006039491a27d7b2dad9d1a2c237e4b9364b
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains text and embedded links promoting a "free Robux generator" which is a common lure for phishing or malware delivery. The primary URL identified, https://netcdn.xyz/app/431946152/free-robux-generator-2021-no-survey-game-hack, is flagged as malicious and part of a redirector chain. While no scripts were explicitly extracted, the PDF structure and heuristics indicate a malicious redirector is being used to likely deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0337

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/431946152/free-robux-generator-2021-no-survey-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_001_off00001560.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1560 25944 bytes
SHA-256: 2e19d62ab5d9099c9ca13f6a60f10c579e0fdf0cdedb5ffac0324292f634aac8
font_01_sfnt_off00005096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5096 18436 bytes
SHA-256: 2c2493788bbc5d6ffe5ffa8723841e988493a4c94ecdb3b847386679d5638995

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