Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff7a0f77d7c7f8d…

MALICIOUS

PDF

27.4 KB Created: 2021-06-18 02:21:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fc2ce818ca053b99f7b60fd62b539598 SHA-1: bcf3c1b8dde1d04b6d22c3694120c0c2b8b00c70 SHA-256: bff7a0f77d7c7f8d29e22227dcc41be1fc086c98691d77034d4bc47155a6bd84
130 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body also contains a call-to-action phrase, reinforcing the lure. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely leading to a further stage of compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.0330

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 http://netcdn.co/app/431946152/free-robux-no-generator-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
font_00_sfnt_off00001626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1626 22620 bytes
SHA-256: 2492035c7b894452404da61dc86e4ac519f5ff1f3864a2e0d3e3329f24dd30cf
font_01_sfnt_off0000489c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x489C 18636 bytes
SHA-256: 235aa573d2856597e474fa52b6b1b400155efd680604698a0f69401ba467d1b7

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