Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f61d5169a8e14d6…

MALICIOUS

PDF

54.1 KB Created: 2020-07-26 12:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79960785bfc4bfcadc7fcc41efcb44f3 SHA-1: 1a5c3cf21f049c4af5e9b3bb53b378c7f208536b SHA-256: 5f61d5169a8e14d6282530904c140e57e57986c8954059b52bdef13994f13997
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 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many pointing to Shopify-hosted PDFs. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting users to potentially harmful 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/wb?keyword=kryminologia%20ksi%C4%85%C5%BCki%20pdf
    • http://files.atkinson-sports.com/uploads/1/3/0/7/130738852/pujajofatopag.pdf
    • http://files.eceti.org/uploads/1/3/1/8/131856353/lisomag.pdf
    • http://files.jenidahn.com/uploads/1/3/1/4/131453365/29153ea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/tazuwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3675/3570/files/pomogakedaxibif.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6757/files/bofagizorodajobadufiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/71312956426.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lebalod.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/68218656651.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4274895189.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97697777452.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/43775487563.pdf
    • https://cdn.shopify.com/s/files/1/0432/3475/4728/files/78176401044.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_off00009261.bin
5ec839277625096ca2251d94ccd1ef5904db16162bfdf0da055b29faa62e95db
pdf-font-stream PDF embedded font (sfnt) at offset 0x9261 5420 bytes
font_01_sfnt_off0000a41a.bin
1ca05c6e74c1d3529e5e2d8faf3de0d1bbdafea4141766cc75c3b5d9e346c2dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xA41A 12132 bytes