Malicious PDF — malware analysis report

Static analysis result for SHA-256 7876a5577755e387…

MALICIOUS

PDF

39.9 KB Created: 2020-08-22 03:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db08317006be2266b14435e7750f8ac6 SHA-1: f0f9cf76f9f0e26097c758ff363a0f896000494c SHA-256: 7876a5577755e387ca442311a5f3ace66a7793a7b5dd3ff786ed7d5f7c5668de
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.ru/pify?keyword=android+authority+promo+code'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many pointing to Shopify domains. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF filenames, suggesting a lure to disguise malicious activity.

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=android+authority+promo+code
    • http://vosobej.thompsonseptic.com/uploads/1/3/2/6/132683056/budumeduri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3111/7467/files/applied_research_and_evaluation_methods_in_recreation.pdf
    • https://cdn.shopify.com/s/files/1/0434/2756/1621/files/10374079149.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/bizoninelaxigafuxogetalet.pdf
    • https://cdn.shopify.com/s/files/1/0428/6060/9703/files/1750748359.pdf
    • https://cdn.shopify.com/s/files/1/0433/5557/0341/files/ubuntu_install_mpi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7076/6750/files/65169000784.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1437/files/aix_command_reference.pdf
    • https://cdn.shopify.com/s/files/1/0432/7325/7116/files/zojamaruzetazimofibozep.pdf
    • https://cdn.shopify.com/s/files/1/0462/8322/7296/files/codecombat_level_13_hack_and_dash_answer.pdf
    • https://cdn.shopify.com/s/files/1/0434/7897/4616/files/titudelavunomesapenas.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_off00005dc9.bin
1214ec0df612ab1ee12599bb3399c312f69ab79a44d2840a54d4da5f6665b754
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC9 5196 bytes
font_01_sfnt_off00006f48.bin
c3e62bbd1d7721c5092a681a4ab5a69fa5237ed6500b585b5719db31adc52a0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F48 10524 bytes