Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab674064e31435a…

MALICIOUS

PDF

38.5 KB Created: 2020-08-29 14:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e7847e1e48739ab7f913303a45da4e2 SHA-1: 53db04bfa7011d727f0ff62007c8d68156b1baa0 SHA-256: 8ab674064e31435a95b9ac0b7091e399ffbdb3b94d4a2c8145e77599049de92d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm used for SEO manipulation or to obscure malicious destinations. One critical heuristic identified a direct link to a known malicious redirector at 'https://ttraff.cc/wix?keyword=iec+electrical+symbols+for+autocad'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the redirector URL and other Shopify links, suggesting an attempt to lure users to 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.cc/wix?keyword=iec+electrical+symbols+for+autocad
    • https://cdn.shopify.com/s/files/1/0429/6704/0154/files/fagurevegifofutedeniniwow.pdf
    • https://cdn.shopify.com/s/files/1/0428/5222/1091/files/kasuwawunukofojazubiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/9305/6933/files/understanding_earth_6th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0457/5061/6220/files/kuzoxufulazuvepavino.pdf
    • https://cdn.shopify.com/s/files/1/0431/3969/4741/files/wastewater_treatment_processes_and_technologies.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2b54085ec3641cf92a9321c5c3a165d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b8de2b1e7c4488981b714c67afae6f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_f624fbbfb4d7446c9c5980f4503ad540.pdf
    • https://static.usrfiles.com/ugd/b8c837_616489f646b44c4f97f250f1b4d87860.pdf
    • https://cdn.shopify.com/s/files/1/0434/4663/2614/files/towonogik.pdf
    • https://cdn.shopify.com/s/files/1/0438/9978/1288/files/binomische_formeln_bungsaufgaben.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_off00005711.bin
5a20d24a542e1ee76b085414ec34fcc680fce767a8f6383aa7bde85ed7f3a8bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5711 5348 bytes
font_01_sfnt_off0000691d.bin
c893c4fe6156c62ce54977d343a8b75ef9466ae56e8e727b93338196edafdb41
pdf-font-stream PDF embedded font (sfnt) at offset 0x691D 10592 bytes