Malicious PDF — malware analysis report

Static analysis result for SHA-256 773a68a6f89ad469…

MALICIOUS

PDF

52.6 KB Created: 2020-08-29 06:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e2c434e00bbf37f370675f81d1da0c2 SHA-1: 3ffc10effa45bf50e5707dad45adfde25a4bfcab SHA-256: 773a68a6f89ad46911b3c22865d71e8649f0d5ec4ff2d2a429677468fe9afa75
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to Shopify URLs hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=placa+m%25C3%25A3e+pos+ag31ap+manual', indicating a potential phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and the presence of malicious redirectors suggest an attempt to lead the user to harmful content, likely via a spearphishing attachment.

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=placa+m%25C3%25A3e+pos+ag31ap+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9245/8152/files/37853894158.pdf
    • https://cdn.shopify.com/s/files/1/0429/0809/0535/files/15598410029.pdf
    • https://cdn.shopify.com/s/files/1/0440/8187/3048/files/81545933962.pdf
    • https://cdn.shopify.com/s/files/1/0460/6980/9316/files/word_game_answer_4_letters.pdf
    • https://cdn.shopify.com/s/files/1/0438/1471/5554/files/1036089179.pdf
    • https://static.usrfiles.com/ugd/b8c837_ada2f0721fb04a95b53db7b484ab5e3f.pdf
    • https://static.usrfiles.com/ugd/b8c837_08b91a96f3c442e09092f9c64505cbca.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8c4c6b8ac9e40a89c928cd2f02856af.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a8c5136b98347979ff627a5ad2814d8.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/list_of_industrial_automation_companies_in_pune.pdf
    • https://cdn.shopify.com/s/files/1/0433/1149/7366/files/chitty_chitty_bang_bang_child_catcher.pdf
    • https://cdn.shopify.com/s/files/1/0435/3359/8880/files/carroll_county_gis.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7318f5f86d74ce6b90b071dcefc3fb6.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec67cc3a1201451396d892e0c2da5cc6.pdf
    • https://static.usrfiles.com/ugd/b8c837_36fb915e0096447898b6b4d3571db319.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_off00008837.bin
7411a885a222b0162aab79d38ad878e7e267b412795d0d351f3e90e87c8e687e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8837 5692 bytes
font_01_sfnt_off00009af9.bin
8aef8b2c699d8cec3f9c90bdd1ca9025a8e1307cb2a0e7a713c0ebd2497e95f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF9 13668 bytes

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