Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2118f827bcc9a77…

MALICIOUS

PDF

41.5 KB Created: 2021-05-14 04:30:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e65d3e0f1ef27ced011f084042ece93e SHA-1: c49df510755a904eb44a9d57be8e1164c1b0f6a6 SHA-256: f2118f827bcc9a770274e3f21272d4fb55409ceb053f462668f5941b230540c3
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically advertising a "free Robux generator". The document body and metadata indicate it was generated by wkhtmltopdf, and the presence of multiple redirector links suggests a phishing or scam attempt. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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-com-roblox-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_off0000330a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x330A 33852 bytes
SHA-256: b172b36ff01abf185a35fb9a7901405baf60ff2d7146b6575cb860702dac399b
font_01_sfnt_off00007fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB8 18852 bytes
SHA-256: 4f913a2277500713712aa6cd09c4e12b5f8093088fb24eab89a43b1b22929045

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