Malicious PDF — malware analysis report

Static analysis result for SHA-256 7639ec635030ad85…

MALICIOUS

PDF

33.2 KB Created: 2020-08-09 19:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20383a5b5c0a4a7246d38ebcee5c2e0a SHA-1: 2706272f645177c2a7dd44beaadb102eb0debc37 SHA-256: 7639ec635030ad85028b60e1cb675e234e5b2cc1b71270fee0e8ec54e8169a1b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.com'. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=consequentialism+and+non+consequentialist+ethics+pdf
    • http://files.habitathawaiiisland.org/uploads/1/3/2/7/132741334/bufuvufi.pdf
    • http://parik.gritshoptc.com/uploads/1/3/1/3/131383483/94a668e869d.pdf
    • http://files.belleislepizza.com/uploads/1/3/2/7/132740462/7b7443eb2839.pdf
    • https://cdn.shopify.com/s/files/1/0440/5778/8568/files/house_wiring_electrical_symbols.pdf
    • https://cdn.shopify.com/s/files/1/0430/4768/2201/files/josunexod.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/xupatililagugareg.pdf
    • https://cdn.shopify.com/s/files/1/0440/0034/6270/files/xeginulenemoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/95082245547.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9141/files/bupegejijefaver.pdf
    • https://cdn.shopify.com/s/files/1/0432/6532/7262/files/ny_driver_s_license_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/88627402433.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2902/files/rewrite_the_stars_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/1090/8572/files/78389886386.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_off0000470e.bin
217276a5cbb8cdcfb669612438416066e1f419add226d867fc7be1355153584b
pdf-font-stream PDF embedded font (sfnt) at offset 0x470E 5328 bytes
font_01_sfnt_off00005908.bin
dc751e342e695761325212b474b9603d65a50788a0139ae6c9669521e55ce110
pdf-font-stream PDF embedded font (sfnt) at offset 0x5908 9024 bytes