Malicious PDF — malware analysis report

Static analysis result for SHA-256 775040500fa63534…

MALICIOUS

PDF

42.4 KB Created: 2020-08-18 23:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7e3c34cf3a93591eb17da61d2ce86f6 SHA-1: 913f6482274d2b4ba898e84789d6a9f02a4c1394 SHA-256: 775040500fa635345338997fa5c2f1a00132dc15a4fe207fe3dc4461934bc3b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to a 'Derbyshire times court report' and includes a large number of embedded links to external PDF files, many hosted on Shopify. One of the primary links directs to a known malicious redirector infrastructure at 'ttraff.cc'. The ML classifier also strongly indicated maliciousness. The document's structure suggests an attempt to create a link farm or redirect 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/pify?keyword=derbyshire+times+court+report
    • http://femudu.centralparkdata.com/uploads/1/3/1/4/131453249/17c54fd5dcc657.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/serofukokeza.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/gregg_reference_manual_12th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/69891463559.pdf
    • https://cdn.shopify.com/s/files/1/0431/8271/9127/files/15494923984.pdf
    • https://cdn.shopify.com/s/files/1/0440/7456/5784/files/rezefupilojixugijipazob.pdf
    • https://cdn.shopify.com/s/files/1/0443/1344/4508/files/kovawunasiroro.pdf
    • https://cdn.shopify.com/s/files/1/0436/5906/7550/files/atrial_fibrillation_guidelines_uk.pdf
    • https://cdn.shopify.com/s/files/1/0448/2852/4701/files/art_electronics.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2102/files/puvumemodusezopuwonofibe.pdf
    • https://cdn.shopify.com/s/files/1/0429/3997/3788/files/92702258159.pdf
    • https://cdn.shopify.com/s/files/1/0434/4784/5030/files/seduv.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_off000068cb.bin
f76afa71c8ac575a4185d06e6f0de8accdcac6f33ea598a9c6984edc706b0753
pdf-font-stream PDF embedded font (sfnt) at offset 0x68CB 5172 bytes
font_01_sfnt_off00007a46.bin
36ba71155db5664b26ad48b73ea02e58670b615d0583de13851eb35df17902be
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A46 10120 bytes