Malicious PDF — malware analysis report

Static analysis result for SHA-256 387a1b91ceebb01c…

MALICIOUS

PDF

42.5 KB Created: 2020-08-29 18:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4c9d27e496751bf3124a127597148ae SHA-1: 042ce38f2e2a824da7487dec3019fb7a2fb793bc SHA-256: 387a1b91ceebb01c363baa10da8fe528d97654fb9f0378ad2c130d7bc6d780fe
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/wix?keyword=plant+safety+slogans'. Another critical heuristic identified this as a PDF link farm, indicating a likely attempt to distribute malicious content or engage in SEO abuse. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=plant+safety+slogans
    • https://cdn.shopify.com/s/files/1/0436/9724/2280/files/lymphatic_system_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dovaxetudomorunuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/2772/6489/files/abpi_first_in_human_studies_guidelines.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd8ff4ad550544d0aeebc004da01322d.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d850ccd029d4e1cb951f54a314fe7d0.pdf
    • https://static.usrfiles.com/ugd/5b5da7_a3bf989fa19a46a2b29b7252238cf7fa.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/practicas_de_analisis_tecnico_de_los.pdf
    • https://cdn.shopify.com/s/files/1/0435/8648/6440/files/21298270218.pdf
    • https://cdn.shopify.com/s/files/1/0440/6480/0918/files/the_catechism_of_the_council_of_trent.pdf
    • https://cdn.shopify.com/s/files/1/0432/2390/8520/files/understanding_automotive_electronics_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/8562/6520/files/ideology_of_pakistan_book.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3ae09e087aa487a9991ec7759c3ef61.pdf
    • https://static.usrfiles.com/ugd/b8c837_292e57e6f54449f19591ea43a18221a3.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_off00006a86.bin
b4d79f44910e49280f807cb51ebd43d01ed6ec27321f9ed419844d96ec0bb27d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A86 4944 bytes
font_01_sfnt_off00007b78.bin
728d51856cd0d0fe0fe411d7a2cd6416a25fe0e22a62074e4a0315408df784ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B78 9836 bytes