Malicious PDF — malware analysis report

Static analysis result for SHA-256 de96bfb1df6ef16e…

MALICIOUS

PDF

41.0 KB Created: 2021-05-13 16:33:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d33db10feffbfdf59b6696684c88409e SHA-1: b39b55c1fc7d49618b826c0014ba60fbe8fd578f SHA-256: de96bfb1df6ef16ea76eba974d78016a5b34d3bee25cb20c193b13621c98ff3a
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The embedded URL, 'https://netcdn.xyz/app/431946152/free-robux-codes-no-verification-game-hack', is identified as a malicious redirector. The document body also contains text related to free Robux and a call to action, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000033bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33BC 27340 bytes
SHA-256: bfdbe54eed07f5ea62d2ae80bdb4c7eea4e92a4162846887aeaa8807696adba6
font_01_sfnt_off0000739b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x739B 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off00007d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5C 18776 bytes
SHA-256: 1501cc25bcf8c3b3bf9df14f68216c1cc39cc5b0131e4343b63bafa21afb9c06

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