Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81a7378769be788…

MALICIOUS

PDF

39.7 KB Created: 2021-05-12 18:07:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8cacfd055ca8994bd8e9e1fe71831853 SHA-1: ca0261c9ad2db89d71ef5ee82937c4f6447aec4d SHA-256: b81a7378769be7880ddca2375ddeff403c79bd5f602b5c5785032fd7f298f4e2
130 Risk Score

Malware Insights

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

The PDF file contains a lure related to 'Roblox Free Pants' and a prominent 'CLICK HERE TO ACCESS ROBLOX GENERATOR' call to action. It includes a critical heuristic firing for a malicious redirector link pointing to 'https://netcdn.xyz/app/431946152/roblox-free-pants-game-hack'. This suggests the document's primary purpose is to redirect users to a potentially malicious site, likely a scam or a distribution point for further malware. The document authoring application (wkhtmltopdf) and embedded artifacts are noted but do not directly contribute to the attack pattern beyond file type.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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/roblox-free-pants-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3350 26460 bytes
SHA-256: 648c1e6ee6302d4be4adc5dd8a8e5c3f6bce44771152a5399c30217d0f78f266
font_01_sfnt_off00006f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F70 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000795b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x795B 18436 bytes
SHA-256: 78f3703c71bf5a91131aef5e2f3ca285f6435d0e4871a8e776917510e9a384af

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