Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f3dab84a32c782…

MALICIOUS

PDF

41.9 KB Created: 2020-08-29 03:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 256a353bea2da767e1a8633f5d638c83 SHA-1: b953cf38064a602afd9fb580072cf2c497f1a30c SHA-256: a0f3dab84a32c7827220fa021247ec73b8b24ae1743b1d4e4bac5fdcf29c9438
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.me/wix?keyword=facturer+en+linea+de+chedraui', which is also listed as a malicious redirector. Additionally, the file exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources, suggesting an attempt to distribute or obscure malicious links.

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.me/wix?keyword=facturer+en+linea+de+chedraui
    • https://static.usrfiles.com/ugd/b8c837_46682a80216343feb2759780646ef187.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ccab0dcb39c422a93d46f27745498c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_d974b2306f6b4da9a81170ed331ec1c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_83d9601ec8064fedad76d0083f4f3d32.pdf
    • https://static.usrfiles.com/ugd/b8c837_222deceaae0748d1927b6cf8a0228f86.pdf
    • https://static.usrfiles.com/ugd/b8c837_748595b44b634482ad4210d496bfe28b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8d5142e7c894a51bdee1eaed8d5c0eb.pdf
    • https://cdn.shopify.com/s/files/1/0432/4648/5672/files/1860208271.pdf
    • https://cdn.shopify.com/s/files/1/0438/0993/1426/files/airport_codes_iata.pdf
    • https://cdn.shopify.com/s/files/1/0436/3649/0398/files/crayon_box_that_talked_activities_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/6248/5407/files/free_oxford_dictionary_english_to_punjabi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/fisadafojewide.pdf
    • https://cdn.shopify.com/s/files/1/0431/0482/9589/files/60921650116.pdf
    • https://cdn.shopify.com/s/files/1/0432/2213/9041/files/merusutevesumizebeverejoj.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_off00006623.bin
54bd9889ccadd0eae76ef40d6234f1947dc33debdb2d64dd4433a108ab902bfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6623 4804 bytes
font_01_sfnt_off00007665.bin
3ce44db6dede28bfc109495ec6dab93b0a08e106f9bd43e511a8067ad97793cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7665 10696 bytes