Malicious PDF — malware analysis report

Static analysis result for SHA-256 5395bc36085d96c1…

MALICIOUS

PDF

34.9 KB Created: 2020-08-14 21:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 201c7b960e0a327cfbf15c150a2dabfd SHA-1: 684658ebbfa2f9aeeb2261da9b3efd5b79423b38 SHA-256: 5395bc36085d96c1dbc0ffc3c0f68f83caf36e9a77665f8deb2aaa9f68349f9b
154 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to a known malicious domain, ttraff.com. The document body, though partially corrupted, suggests a lure related to a 'metric conversion worksheet answer key'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy to potentially improve search engine ranking for malicious content or to distribute further payloads. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=metric+conversion+worksheet+1+answer+key+pdf
    • http://files.caddisshackguideservice.com/uploads/1/3/1/4/131453136/vijewetudavat-tutok.pdf
    • http://files.jovalynne.com/uploads/1/3/1/3/131378776/2813515.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6982/files/58432010681.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0353/files/51410267217.pdf
    • https://cdn.shopify.com/s/files/1/0440/6460/4310/files/piravinefevogoxogotamukuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3208/files/bamupinawi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4238/files/99983612092.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6906/files/tuvasefojalepajaribot.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3658/files/ronir.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_off00004a6a.bin
ff8001d5b7e9c4a8ec439958a0c195eda3475738ba655e1d5aadbbe291efc6fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A6A 5584 bytes
font_01_sfnt_off00005d94.bin
a729f4d531e535d25d67c5f7929a0295d004bfd6c1b7519910b8e40eca09f2b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D94 9788 bytes

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