Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e61f038b9f406a…

MALICIOUS

PDF

43.8 KB Created: 2020-08-14 03:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d8f0e6da9389e64f0081b48ad690bf2 SHA-1: e378f48866ef842a3c9317862826404d28216b3a SHA-256: 70e61f038b9f406a41aa50412af3bf4ff6d4602d0949ed03c4afdc547b8a64ad
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Discogs record grading guide'. The presence of many external PDF links suggests a link farm or SEO poisoning attempt to distribute 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/pify?keyword=discogs+record+grading+guide
    • http://pejekider.blitzenestate.com/uploads/1/3/1/6/131606739/9081a41176068.pdf
    • http://files.altheadesigns.com/uploads/1/3/0/7/130738593/gonavusitana.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0443/0325/3660/files/20082043049.pdf
    • https://cdn.shopify.com/s/files/1/0430/5567/7591/files/95713378743.pdf
    • https://cdn.shopify.com/s/files/1/0434/5056/4773/files/appropriate_technology_definition.pdf
    • https://cdn.shopify.com/s/files/1/0431/9834/9471/files/48345940969.pdf
    • http://files.mkumar.people.ua.edu/uploads/1/3/1/4/131437984/kaxogodevusume.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/30437816052.pdf
    • https://cdn.shopify.com/s/files/1/0428/5497/3606/files/60054154362.pdf
    • https://cdn.shopify.com/s/files/1/0438/9502/9915/files/monofozutajen.pdf
    • https://cdn.shopify.com/s/files/1/0437/0310/7752/files/29879953780.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/53004633991.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6977/files/ap_budget_2020_download_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/mexoberokopojagezepuz.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_off00006dc4.bin
8cf54b540f4b124070af64998d0ff76ddb381f1b75e6e594f5dfc0364cf49e0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC4 5076 bytes
font_01_sfnt_off00007f07.bin
101ea1e402f33062243df6fa9fc27629ebcd3823396cbda2200b58811c7c6961
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F07 10324 bytes