Malicious PDF — malware analysis report

Static analysis result for SHA-256 670ede9537f94bb5…

MALICIOUS

PDF

42.2 KB Created: 2020-08-31 21:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d95305196a232a5d609ad3692383d852 SHA-1: bf3e9bfb3c5e9b5ab4f5394a0d9f3a102656883a SHA-256: 670ede9537f94bb5b0903f4904ad10a4540857a55a76929ee9dc220ba143094e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, including one pointing to the malicious redirector infrastructure at 'ttraff.com'. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the embedded links are the primary vector for this attack.

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=android+auto+bmw+retrofit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_5a3aad96472b4f5dad6163e97837cec8.pdf
    • https://static.usrfiles.com/ugd/5b5da7_31e569f3814140079e251e43d037a2df.pdf
    • https://static.usrfiles.com/ugd/b8c837_44121cb3184d4762b3b64512f465a8bb.pdf
    • https://cdn.shopify.com/s/files/1/0434/0888/3870/files/64983408648.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9588/files/72160695035.pdf
    • https://static.usrfiles.com/ugd/696117_6c1dde06efda45c69d6983b916c6f00c.pdf
    • https://static.usrfiles.com/ugd/9ea91e_66760f3045a24effbc749646dc116cea.pdf
    • https://static.usrfiles.com/ugd/96bf9d_5bbab3d4cb894884b40fb53df47d0b98.pdf
    • https://static.usrfiles.com/ugd/8de238_721e1f918c914b40b17c63a5b898c537.pdf
    • https://static.usrfiles.com/ugd/0aab01_395949efd1354f648e2354696e5f5484.pdf
    • https://static.usrfiles.com/ugd/c1de29_e259a3eb47ba4d508d54a4cb51a9cd62.pdf
    • https://static.usrfiles.com/ugd/c068f8_5ebed02839334ca6bccd9d0e3f76604d.pdf
    • https://static.usrfiles.com/ugd/ba3095_7b30a6a4daf548a2a9dc8c179d795bc3.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f22.bin
36357d8fb5e06ddbcf30da97a458c69c4e9358781bcb9c299d7502661209d06f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F22 5064 bytes
font_01_sfnt_off00007057.bin
ea69fb5365477e1c7a56cae6d11d4574020eb8a478076551e636f57148a36532
pdf-font-stream PDF embedded font (sfnt) at offset 0x7057 14212 bytes