Malicious PDF — malware analysis report

Static analysis result for SHA-256 94de2791b6659e5e…

MALICIOUS

PDF

41.9 KB Created: 2020-08-29 22:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d35e7a5a37b3a7d45ceb934822ad2f43 SHA-1: 11d0e97055e70bdb872bbfb1476b685539ff1f93 SHA-256: 94de2791b6659e5e773be88ea2d5e19e2444e28a8d44b2bc83f3d67197ba8910
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text, though partially corrupted, includes the URL 'https://ttraff.ru/wix?keyword=electric+motor+control', which is flagged as a malicious redirector. The presence of numerous links to external PDFs, many hosted on static.usrfiles.com and cdn.shopify.com, suggests a link farm or SEO poisoning tactic 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.ru/wix?keyword=electric+motor+control
    • https://static.usrfiles.com/ugd/0baf77_9a2e327254b743fca606836c4c1b3c2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8b921cfaf69c4d6ab3c0c9fec767e3f7.pdf
    • https://static.usrfiles.com/ugd/ea2f88_caa8ef14883f47baa8e73297c36d47f5.pdf
    • https://static.usrfiles.com/ugd/238140_55c850781a9e4add8c23bdb6266d123e.pdf
    • https://cdn.shopify.com/s/files/1/0461/8587/3561/files/11730116462.pdf
    • https://cdn.shopify.com/s/files/1/0446/0979/8307/files/printable_preschool_feelings_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0438/9090/1144/files/the_sims_2_university_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/guxewevorezilevegepamesid.pdf
    • https://cdn.shopify.com/s/files/1/0436/1037/4307/files/98502513770.pdf
    • https://static.usrfiles.com/ugd/b8c837_923cb4cb10c7400aa2bf14618e7b86bb.pdf
    • https://static.usrfiles.com/ugd/b4a829_fb1e88166fe64a90802b0f856a2494a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_7298ab926a744f9c8e592a741980f1eb.pdf
    • https://static.usrfiles.com/ugd/3bca44_1fdb3a7f65d24bf9b3968cd785876343.pdf
    • https://static.usrfiles.com/ugd/b8c837_99cd530dd41948248b703be9429a89b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_6488a0cfe728435b831603c2fb947484.pdf
    • https://static.usrfiles.com/ugd/b8c837_6821137c406144e4a16a979c4c63d974.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_off000068ca.bin
f9d8f8ca7210158dd23b1d52eaa268fab1952c52d2a71833e66c976b1d885035		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68CA 4516 bytes
font_01_sfnt_off00007806.bin
5475cb2b2587da477fd2673b6d07279b89891d56b7eafa429d00a2d5ff591b77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7806 10460 bytes

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