Malicious PDF — malware analysis report

Static analysis result for SHA-256 818f34726cb9bb41…

MALICIOUS

PDF

39.9 KB Created: 2020-08-15 16:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 384fa6bfa5cfa793ee37ca35ea39e26f SHA-1: 9bbd3ba0e3b52b000a8a09692a25f974d09e4219 SHA-256: 818f34726cb9bb41536e7f5d0b9021d4bdd6a086e646880ed442ca9aa5172901
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious objective. The document body, though heavily obfuscated, contains text related to an 'automatic irrigation system using arduino project report' and the malicious URL, indicating a lure to disguise the malicious intent. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly suggest a phishing or redirection attack.

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=automatic+irrigation+system+using+arduino+project+report
    • http://momanudib.alyssacouturier.com/uploads/1/3/1/1/131164250/gurezesoregididukofo.pdf
    • http://vinenazas.michaeljdyer.com/uploads/1/3/0/8/130874474/sunamuxikilagi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9720/1576/files/gimozitumikizela.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8246/files/81825848977.pdf
    • https://cdn.shopify.com/s/files/1/0431/4755/9067/files/bellarine_rail_trail.pdf
    • https://cdn.shopify.com/s/files/1/0437/3879/2085/files/finolilog.pdf
    • https://cdn.shopify.com/s/files/1/0429/4888/6684/files/autocad_electrical_design.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/74716289505.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/18244912523.pdf
    • https://cdn.shopify.com/s/files/1/0449/9714/8836/files/nerojawawumunijibabotebo.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_off00005cba.bin
54299acdb9540d84d6fa5e6af7d2fe8db77b5e8ff0f5f759cb7267fa0120fa1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBA 5528 bytes
font_01_sfnt_off00006f78.bin
92e16a68de1fdc035efc64fdcba04da1e48a376550ede55b7fa388f3f6f6777f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F78 10352 bytes