Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1a384bf2a21640…

MALICIOUS

PDF

60.0 KB Created: 2020-08-19 21:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb4f6d8c64b4bd892fa43f413125f0f4 SHA-1: c9870fe93722d8e78a627c3fc13f53e5a732e5fe SHA-256: da1a384bf2a21640f0db65f13d7f020c3b2176a4dc59a9ab8d3f1831ea12d067
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm with 30 external PDF links, many hosted on Shopify, and a critical redirector link to ttraff.ru. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be luring users to malicious infrastructure via deceptive links within the document.

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=business+environment+ppt
    • http://files.cardocaps.com/uploads/1/3/1/1/131163872/528713.pdf
    • http://fuzoro.avahomedesign.co.uk/uploads/1/3/0/9/130969352/gusafo_luron_dewamufifize_jinaf.pdf
    • http://josojovik.thebusinessofdoinggood.co.uk/uploads/1/3/0/7/130776007/6276da32.pdf
    • http://files.bodywrapsnederland.nl/uploads/1/3/1/3/131381518/926192.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7063/files/74160900635.pdf
    • https://cdn.shopify.com/s/files/1/0437/2991/1957/files/exemple_de_bordereau_d_envoi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5729/1169/files/90181042401.pdf
    • https://cdn.shopify.com/s/files/1/0435/9979/0243/files/yamaha_apx500ii_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/5704/5916/files/knowing_god_s_will_in_marriage.pdf
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/le_verbe_avoir_au_present_exercices.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/gatelojonomuvugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3784/3871/files/59677122191.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bixebor.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0497/files/gapanisuweropubasiparogev.pdf
    • https://cdn.shopify.com/s/files/1/0435/7960/5147/files/hepatitis_c_testing_guidelines_canada.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ef7.bin
a931ff3fa825443b93b369ae2d426ea300e579fad8992fa37b98769a4031c84f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF7 1724 bytes
font_01_sfnt_off00009784.bin
13a0df9d4b1592b9eafe39afc4226dab95fd14c5dcd3fc6083be086a6e63383c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9784 4716 bytes
font_02_sfnt_off0000a76c.bin
a749ef4df13a792ac41c8d90ce1fab12454c32961b69e98acd4faa9236911bbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA76C 14648 bytes
font_03_sfnt_off0000d4cd.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CD 4324 bytes

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