Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ff24b73599296f…

MALICIOUS

PDF

36.0 KB Created: 2021-05-19 01:16:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 41a4873681613c77c388cc14f1268602 SHA-1: 8c4f5a500c46f4722531965aa535342fca890a54 SHA-256: 97ff24b73599296f218e047b018afb64ce9e722cdca320702cbcfa2a7c071aca
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains embedded links that redirect to known malicious infrastructure, specifically a lure for 'free Robux codes' or 'game hacks'. The document body, though heavily obfuscated, contains text related to these lures and mentions the authoring application 'wkhtmltopdf', suggesting it was generated programmatically. The presence of malicious redirector links indicates an attempt to lead the user to a potentially harmful site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0228

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-codes-no-verification-game-hack In PDF document text
    • https://discordIn 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_off000031de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31DE 24444 bytes
SHA-256: b8a1bb067cc207326a528b36a5bdb13cd64490e0348ce949f8b16faa625739c9
font_01_sfnt_off000069be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69BE 18776 bytes
SHA-256: 1501cc25bcf8c3b3bf9df14f68216c1cc39cc5b0131e4343b63bafa21afb9c06

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