Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae9c9fd64cac196…

MALICIOUS

PDF

44.8 KB Created: 2020-08-30 05:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d53e4cf7f3bbe1e16ea7f613d9dd04f8 SHA-1: acc3ab024a23f87e2631ce481de76316329ba4e0 SHA-256: 4ae9c9fd64cac1968d36c0abeb0f9a8506d40e4d195bcc792cefb529e7876d89
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic firing indicates that a link within the document redirects to known malicious infrastructure at 'ttraff.ru'. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click on these links, which then redirect to malicious sites.

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=city+park+golf+course+new+orleans
    • https://cdn.shopify.com/s/files/1/0433/9551/4535/files/boule_de_suif_livre.pdf
    • https://cdn.shopify.com/s/files/1/0440/8924/5861/files/22191085612.pdf
    • https://cdn.shopify.com/s/files/1/0443/5791/0684/files/cafissimo_pure_instrukcja.pdf
    • https://cdn.shopify.com/s/files/1/0449/2584/5659/files/sony_cdp-_cx355_manual.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_321a8425596941ec92fdcb2b8fee0ced.pdf
    • https://cdn.shopify.com/s/files/1/0436/3229/6089/files/accounting_concepts_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8503/files/82021681869.pdf
    • https://static.usrfiles.com/ugd/b8c837_ac4be774ca5b438e9e2f23ee1d73a232.pdf
    • https://static.usrfiles.com/ugd/3eed2b_e7aea802990640898fbe07d58278654b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0ec9d01b5224ac2b0db595c21313d7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_e303e836fcfc4286a25534a1be6a9e77.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006031.bin
c3db9968f77f44ef874eeb965eaecd5433ef045a3feb981aab99ebdf65510670
pdf-font-stream PDF embedded font (sfnt) at offset 0x6031 5348 bytes
font_01_sfnt_off00007290.bin
34cc678c34dcfa4e05c42806adc8977d14e7f3ccd68770af150e2de94927f412
pdf-font-stream PDF embedded font (sfnt) at offset 0x7290 10968 bytes
font_02_sfnt_off0000980b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x980B 4324 bytes