Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f2141ff2a36498…

MALICIOUS

PDF

51.2 KB Created: 2020-08-31 19:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35ffb8c49eb21910470b79d1d85ce8a9 SHA-1: 1ad81f5474fd4bbfc3c487e7eb3e0c0ccc6566e9 SHA-256: b4f2141ff2a364980d9359981b1042e3e28287d858088bf63ae2c2e3bfb7717f
152 Risk Score

Malware Insights

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

The PDF 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.ru/wix?keyword=instrumental+dance+beat', which is likely the primary malicious payload delivery mechanism. The presence of a large number of external PDF links also suggests a link farm or SEO poisoning attempt.

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=instrumental+dance+beat
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/39007049786.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/54334067721.pdf
    • https://cdn.shopify.com/s/files/1/0435/4375/6954/files/22325786320.pdf
    • https://cdn.shopify.com/s/files/1/0432/8849/4236/files/rafaredibupaj.pdf
    • https://cdn.shopify.com/s/files/1/0438/7323/9195/files/79298083127.pdf
    • https://static.usrfiles.com/ugd/a467d2_75ef9629875e4297b840ce5c62ab6d89.pdf
    • https://static.usrfiles.com/ugd/87a178_e61e59cfb95c4661818b1ecd5bc4e3ae.pdf
    • https://static.usrfiles.com/ugd/b5472a_0f6fca2a42de4d1480e37bd2ee48668c.pdf
    • https://static.usrfiles.com/ugd/c5d40f_a880c3f16f044611b982cd3e1b1e9e3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3ae09e087aa487a9991ec7759c3ef61.pdf
    • https://cdn.shopify.com/s/files/1/0440/7921/8838/files/carrier_air_conditioner_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/1647/8110/files/pikojusimiwuxut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0304/3230/files/kimodogewu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4981/0080/files/74158814727.pdf
    • https://cdn.shopify.com/s/files/1/0437/1641/1547/files/60954876679.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_00140febd3b14cc1b7a2aa8a6333aabe.pdf
    • https://static.usrfiles.com/ugd/b8c837_8aa89042ee9c41ecb5901bec76370f92.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_off00007d62.bin
130e5115d51a265e54afbde401adca46e8f992fb9793845cfa4518458081279b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D62 5164 bytes
font_01_sfnt_off00008ece.bin
3c909ab1cb1568cd21ff12b403a89781d3cc6fe5c837fef0edb2cc5bc630e81b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8ECE 15936 bytes