Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b9540cb09f63f6…

MALICIOUS

PDF

42.1 KB Created: 2020-08-30 23:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3279b0d819180b3d1b9c20cb39fa9d9e SHA-1: c136a30d204957380fe2383b6d69e1daa580130c SHA-256: 89b9540cb09f63f6adbc0824e3e9a13f060128f6ae9f1db5fdb0d5884e11ed4f
152 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.com/wix?keyword=msp+hack+sans+verification+humaine+rapide+gratuit', which is also listed as a malicious redirector. Additionally, the PDF exhibits characteristics of a link farm, with numerous external links, suggesting a coordinated effort to distribute malicious 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=msp+hack+sans+verification+humaine+rapide+gratuit
    • https://static.usrfiles.com/ugd/b8c837_004b04228d004325abd11dc9426fcc80.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7dec993685842a59996048e02d31b77.pdf
    • https://static.usrfiles.com/ugd/191a6d_eb1bf8271bac40dfa3c8f1effa9c0e56.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0d15a98e73a46568002f219140aba0e.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/armiger_warglaives_rules.pdf
    • https://cdn.shopify.com/s/files/1/0433/3636/8296/files/tachibana_san27s_circumstances_with_a_man.pdf
    • https://cdn.shopify.com/s/files/1/0437/8034/1917/files/physically_and_mentally_challenged.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tadigepulimo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4718/1718/files/medical_biochemistry_question_bank.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/datumaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/14779471486.pdf
    • https://cdn.shopify.com/s/files/1/0457/8669/3798/files/84610043708.pdf
    • https://cdn.shopify.com/s/files/1/0438/2516/8544/files/4446085567.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_off000061d1.bin
813bec7563b7a5521947193c5259ecbfff3faa276e9f415985efa466d9bf1c9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x61D1 5668 bytes
font_01_sfnt_off000074fd.bin
1a6479e56392a92a9880eec2f4a307167976059a6737e483b688ba0286a6c2ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x74FD 12064 bytes