Malicious PDF — malware analysis report

Static analysis result for SHA-256 937cd6cc500ffee4…

MALICIOUS

PDF

38.0 KB Created: 2021-05-19 02:02:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 76f98ebfa26a43badf0e75d4b2f06843 SHA-1: ba6167fb9caffeacd0e5fa2b93efa7e30b8358eb SHA-256: 937cd6cc500ffee44db17342fbdbdb2c72da4ecd3bd7081de0adf2f340518bfd
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL associated with "free Robux" and "game hacks". The document body and embedded artifacts further reinforce this by containing similar lures and the malicious URL. This suggests a phishing or scam attempt designed to trick users into visiting a malicious site.

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-safe-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_off000035f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35F2 27540 bytes
SHA-256: b0ca83aa4c107b5721899deda27a6550de5905be674746a4bd127af9dcf94cc5
font_01_sfnt_off0000735c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x735C 18244 bytes
SHA-256: 393a0339ec2761f14ea9b29efa8c9c5fc9788b4979bd41a030a3ecef46023b5f

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