Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c987c934ff11698…

MALICIOUS

PDF

41.4 KB Created: 2020-08-12 19:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94641697e98671f7bd4ac103b03a5d0a SHA-1: 19aa0177ce8e83b98375bd3aea4364de5b5eb1cb SHA-256: 0c987c934ff11698eba543745621fc3cf799153c8b8271ea24f301c2decfc8fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify domains, but one critical link redirects to `https://ttraff.ru/pify?keyword=cd4047+inverter+circuit+pdf`. This behavior, combined with ML classification, strongly suggests a malicious redirector designed to lead users to harmful content. The document body itself is heavily obfuscated and contains embedded URLs, further supporting the malicious intent.

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=cd4047+inverter+circuit+pdf
    • http://zebuxon.melbournehistoricalcrimetours.com/uploads/1/3/1/0/131070109/6823193.pdf
    • http://files.silverstreamfalls.co.nz/uploads/1/3/2/6/132681303/musox.pdf
    • http://files.sklgtraining.com/uploads/1/3/0/8/130814535/nuliketo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7594/4091/files/ruzixas.pdf
    • https://cdn.shopify.com/s/files/1/0438/4571/4077/files/25658525043.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/xeteranebaputal.pdf
    • https://cdn.shopify.com/s/files/1/0438/5567/5552/files/fazibof.pdf
    • https://cdn.shopify.com/s/files/1/0451/3703/5429/files/tools_of_effective_communication.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2854/files/kufuxinuxuwuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/79916608616.pdf
    • https://cdn.shopify.com/s/files/1/0430/0842/6147/files/tuwogonobosutimamo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0098/6787/files/rabezulisu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/85579370887.pdf
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/bhavnagar_newspaper_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6241/files/sevomosikoforavetenave.pdf
    • https://cdn.shopify.com/s/files/1/0429/8260/4963/files/brche_addieren_subtrahieren_arbeitsblatt.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_off00006528.bin
d37cbc1c9d3e63cda8ff34d9b9f7d2b8974b9290daaa03f207c45e45540d4802		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6528 5004 bytes
font_01_sfnt_off00007656.bin
ace89d9c53b57373c011fa895ab3627aff7bff3820bcb9e7670a471562a8aeba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7656 10052 bytes

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