Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b43629facc0b857…

MALICIOUS

PDF

43.1 KB Created: 2021-05-15 14:00:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d7413449cb6eba9d258f94549c64ecb2 SHA-1: 4cae0869a63dd65fed9622de3db3f6742f464839 SHA-256: 3b43629facc0b857cccb3b60d6bb5986d1e1ae66992925d00f7aa2d2eed684b9
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising 'how to hack Roblox to get Robux'. The document body also contains similar lures and a call-to-action phrase, indicating a phishing or scam attempt. The embedded URLs are the primary indicators of malicious intent, suggesting the document is designed to lead the user to a compromised or malicious website.

Machine Learning

  • Nyx PDF Classifier clean score 0.0149

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/how-to-hack-roblox-to-get-robux-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000033c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33C5 30700 bytes
SHA-256: fd47a26daae6116f2ac4cfd924e30d723766a66aed418abbd4dc41e60b178468
font_01_sfnt_off000077f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77F4 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off0000849c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x849C 18996 bytes
SHA-256: dc0d6546e0fba36c88c62bb99db67dba9ca81d7a652023b2240737c7a02d68b7

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