Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8802c75d141240a…

MALICIOUS

PDF

38.0 KB Created: 2020-11-01 18:02:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 059f40ec5e9df07aaa2bd74d469a3168 SHA-1: 10c8ed165bdf5a90663003c2f70f01ffa16c9892 SHA-256: c8802c75d141240a5695eb83747a39ba06df2c6ba827be8c76c8a68a0513f34e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.club/123?keyword=traditional+thai+clothing+men+for+sale'. It also exhibits characteristics of a PDF link farm, containing numerous external links, many of which point to S3 buckets and Weebly-hosted PDFs. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The document body, though heavily obfuscated, contains the primary malicious URL and other PDF links, suggesting the file's purpose is to redirect 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.club/123?keyword=traditional+thai+clothing+men+for+sale
    • https://muropezevoride.weebly.com/uploads/1/3/4/5/134514904/7fb91d1c.pdf
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/retojogofejikebo.pdf
    • https://xamegazu.weebly.com/uploads/1/3/4/4/134440804/2407675.pdf
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f9cc23901887.pdf
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/tivuke-sigovitukom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mizeteb/tinakexeguporibosozona.pdf
    • https://cdn.shopify.com/s/files/1/0433/5448/8990/files/41313243143.pdf
    • https://s3.amazonaws.com/xipavir/jugomuxure.pdf
    • https://s3.amazonaws.com/fovezewi/appetites_a_cookbook.pdf
    • https://s3.amazonaws.com/sojebelevenex/air_force_strategy_game.pdf
    • https://uploads.strikinglycdn.com/files/8eb78517-dbcf-4ed8-9bcc-966da9d38513/laxeririxakawopadatu.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/66443339588.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005337.bin
e1fa1dc63b0204100bcd7dc4fd9dfcd5468fa654a361b79a30e5f8c759382774
pdf-font-stream PDF embedded font (sfnt) at offset 0x5337 5384 bytes
font_01_sfnt_off00006556.bin
c5f6f4ed9963b52f92c295bd2cadd9c59d43864fd11d06dbad6dfd2b45cd2a0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6556 11448 bytes