Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67525d2b4d2029e…

MALICIOUS

PDF

59.7 KB Created: 2020-08-31 09:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8370b4f0c0cc96e0ecf86a1841a0f24 SHA-1: 6cb31fe47f6868d82e9762e520188ad4bbf07302 SHA-256: b67525d2b4d2029e092b01059d382f628ba4cc98664c8028eac4b4d934f45b1e
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lead users to further malicious sites. The document body, though heavily obfuscated, contains the same malicious URL and references to other benign-looking PDF files, suggesting a link farm or redirection tactic. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is part of a malicious campaign.

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.ru/wix?keyword=mythe+de+th%25C3%25A9s%25C3%25A9e+et+le+minotaure
    • https://static.usrfiles.com/ugd/b8c837_7a738bd1569b4c1b8ac1690591a78efb.pdf
    • https://static.usrfiles.com/ugd/8b2c09_a894b04b461744d393607239505d87f2.pdf
    • https://static.usrfiles.com/ugd/19103d_9d5dcdd9d5ba48aeaa33bf7584d602f9.pdf
    • https://static.usrfiles.com/ugd/52b593_e94ccd9784b4419caf26cd6713c2c383.pdf
    • https://cdn.shopify.com/s/files/1/0435/9605/4690/files/71251500561.pdf
    • https://cdn.shopify.com/s/files/1/0429/0802/4985/files/27248718102.pdf
    • https://cdn.shopify.com/s/files/1/0431/9694/0448/files/algebra_word_problems_worksheets_year_7.pdf
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/49327205715.pdf
    • https://cdn.shopify.com/s/files/1/0433/8558/5820/files/simple_addition_and_subtraction_worksheets_for_preschoolers.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/90193330033.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/61426691821.pdf
    • https://cdn.shopify.com/s/files/1/0431/9723/5363/files/jikuvotixenavudakusuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4456/9242/files/jajelobusukix.pdf
    • https://static.usrfiles.com/ugd/b8c837_7331cb75466f4d14ab4eec207a33c1d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_545b203e077f4949b197755b78cd63af.pdf
    • https://static.usrfiles.com/ugd/b3bc21_c0b52552126647b69f9a50a58dfaa026.pdf
    • https://static.usrfiles.com/ugd/735189_20e1fd49eb8a4fb0a113b0b6e47eed46.pdf
    • https://static.usrfiles.com/ugd/ae059d_1249aafe1f8a452980340883039bac29.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_off0000a73c.bin
f06ea43d78c13a06a9466d786db16592870f6279ee54a65fd0f69bb73fa70ec1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA73C 5312 bytes
font_01_sfnt_off0000b8ed.bin
2c1a0f8edc0cd737e638d04740a54e90af0b1f78d16a70899f5b1d831f2ec4a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8ED 12464 bytes

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