Malicious PDF — malware analysis report

Static analysis result for SHA-256 764a9647584b27cf…

MALICIOUS

PDF

39.7 KB Created: 2020-08-28 20:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39e357b0421f3f755ee574e3dca88944 SHA-1: 00f61de5a5b5ba86f697509a15fe18bda1f4c024 SHA-256: 764a9647584b27cf9a963280db2f70926ce90c053295dea7bfbd725b68dbd1b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'c pack 300 6g parts' and includes the malicious URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to distribute the 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.ru/wix?keyword=c+pack+300+6g+parts
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0462/7536/2965/files/fuwunilezojo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0452/5720/files/4522271684.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/20837790770.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdf
    • https://cdn.shopify.com/s/files/1/0428/8882/2950/files/illinois_foia_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/2567/0042/files/predictive_analytics_in_hr.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/browserify_transform_babel.pdf
    • https://static.usrfiles.com/ugd/b8c837_086d752e20924578be7c702e81248317.pdf
    • https://static.usrfiles.com/ugd/b8c837_4cf83f491a9749a1b00babc78116eb85.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2bbc7df612f44b98b4b924f4a1a7a61.pdf
    • https://cdn.shopify.com/s/files/1/0430/7219/2669/files/15956223886.pdf
    • https://cdn.shopify.com/s/files/1/0431/7488/7573/files/acute_respiratory_distress_syndrome_jama_2018.pdf
    • https://cdn.shopify.com/s/files/1/0433/9944/6693/files/xugenisuj.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_off00005c39.bin
120becd79818ec821d9b6113698133571ae3946c787fbb6a802ef24678417bf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C39 5496 bytes
font_01_sfnt_off00006ef7.bin
f2aaf2c8bf8a2e69456837b010c3da04ca5cf51172890f209a8f13c9c94617e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF7 10332 bytes