Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7586c355d39429…

MALICIOUS

PDF

33.0 KB Created: 2020-08-31 05:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34573b4e3525e5f8818f99c2bb0004a2 SHA-1: 3da5c3d10b0a49b81edf57e34f01955cb498d626 SHA-256: 0a7586c355d3942977e5c8d4a6800cbe3037eeb8062bf5b46a827e973992a62c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links, one of which, https://ttraff.cc/wix?keyword=lax+max+new+generation+portable+speaker, is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to a portable speaker, likely a lure. The presence of numerous external PDF links, many pointing to static.usrfiles.com, suggests 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.cc/wix?keyword=lax+max+new+generation+portable+speaker
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_e303e836fcfc4286a25534a1be6a9e77.pdf
    • https://static.usrfiles.com/ugd/0d002d_02f389ce84ff4cc7bd4e1489840d51f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f31e5b92342443bbf0fd6b95516c983.pdf
    • https://static.usrfiles.com/ugd/b8c837_98f4388ee5e94d30af131694b62b071d.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fb4484087e64ace9d7fdfd0b98e83e3.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/zojivebuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73792904944.pdf
    • https://static.usrfiles.com/ugd/405339_fdc074ccaf5f4254b64d8f717d3176a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_e05f61f635564c39ac56fe817fd34e91.pdf
    • https://static.usrfiles.com/ugd/10e3af_db07e35cc6f74a07a9027afc19799ed2.pdf
    • https://static.usrfiles.com/ugd/f84671_97fe2cddd1644287aa87348eb8f0879c.pdf
    • https://static.usrfiles.com/ugd/b8c837_bec52d215bef415bab6634e77357ab05.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3038ad3382743449eeb5dded17d5135.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_off0000434d.bin
b5b853d109f75715246e1a5d8a0b75cf5881cc0998ed7b6cb867ffb1d415c2ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x434D 5444 bytes
font_01_sfnt_off000055ce.bin
358a54a7658659f61d19c0727c2d446e811383925575eb8b92dc1bb44b40bae9
pdf-font-stream PDF embedded font (sfnt) at offset 0x55CE 10004 bytes