Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29f43da2a2448a4…

MALICIOUS

PDF

44.0 KB Created: 2020-09-02 14:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 168d6efb048034ac715bdb1b43c9b5f3 SHA-1: a879f409c42741b5fb5b7d6ceb31dcfd5dfa3db6 SHA-256: b29f43da2a2448a40c88e4824f5177e8f7c56bbb93566cafae85dfe0ed29f305
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.me, which is disguised as educational content. This redirector likely leads to a malicious site. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning attempt to drive traffic to the malicious redirector.

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=biology+corner+worksheets+microscope+use
    • https://static.usrfiles.com/ugd/fb5067_81b9265efe79434094b4ab05e78d7a1d.pdf
    • https://static.usrfiles.com/ugd/3eed2b_de4098e3de6b49ba9e285a9e660fa731.pdf
    • https://static.usrfiles.com/ugd/b8c837_41739e46bade405d8169c1762424a5e1.pdf
    • https://static.usrfiles.com/ugd/8cbfce_3091b83a091b40e1ba9adb203bbc6e2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd134cce73ed48b3b14e5292415ba184.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/mijokazobefesirijewugazi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7248/files/virovimufumufudepidijegis.pdf
    • https://static.usrfiles.com/ugd/66c878_8f810cf7eb45435c8ae8f40255acaf06.pdf
    • https://static.usrfiles.com/ugd/fb5067_b9cee47fdaf546689aa74676c6acddd9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5254cda8ee940a693c157be1c2482af.pdf
    • https://static.usrfiles.com/ugd/b4a829_36b6f29ffc5346c4960163588122856a.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_off00006c74.bin
5be9d770e89da0c69366f346e8a131510d3d9a97a68c345b719dac3755e81783		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C74 5444 bytes
font_01_sfnt_off00007ef3.bin
405965978f0023c1dd91ffb3d5ae4d24551f963a3c5ee455f1d28082a859b553		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF3 10080 bytes

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