Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa067db55cf568b…

MALICIOUS

PDF

39.9 KB Created: 2020-08-30 05:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bc4f9ad85291643654aa69028d95ed9 SHA-1: d0704328af619858edf803b993f2fdcc15ced555 SHA-256: faa067db55cf568b146a6e9a88d1fc98ee261baffb43247d98977415b3397815
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=gta+v+gold+medals'. The document body, though heavily obfuscated, also contains this URL and references 'Gta v gold medals', suggesting a lure. The ML classifier also strongly flagged this PDF as malicious. The file's purpose appears to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.com/wix?keyword=gta+v+gold+medals
    • https://static.usrfiles.com/ugd/724bd4_60d588b81a984d6286993c0767e25ea6.pdf
    • https://static.usrfiles.com/ugd/b8c837_25b8f540408a48219d9e3c2ab14e0c74.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6f2e82f2056476c8f128984f862d88f.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/49004096207.pdf
    • https://cdn.shopify.com/s/files/1/0435/2930/6263/files/25353514345.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/24183598992.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/esp8266_arduino_core_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0433/7506/7297/files/87567488044.pdf
    • https://cdn.shopify.com/s/files/1/0440/8590/3525/files/jitojukenegosamitabuwa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/madupi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1329/files/merge_logiciel.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f01.bin
d569aa9456ba28756d13dc6bc7f5173571182e1610926858b1e9f6686e7e82a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F01 5140 bytes
font_01_sfnt_off00007081.bin
e25feecfb2ecaf571a0edd822fcec50904414bd9c7c0e94b685c1098d6a1fa30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7081 10192 bytes

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