Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df589d40cf1cdce…

MALICIOUS

PDF

59.7 KB Created: 2020-08-21 11:39:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 291c7b08038d62d57b9e7c874529ab4c SHA-1: 7ee0da598443a4fb8d369279ee2feab48773decb SHA-256: 8df589d40cf1cdce0b1b97c0c4e55d01d7b8588920fa5146171b70b60bf088e8
154 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a known malicious URL, disguised as an employment tribunal settlement agreement template. This indicates a phishing or social engineering attack. The ML classifier strongly supports the malicious verdict. The presence of numerous links, including to Shopify, suggests an attempt to obscure the malicious destination and potentially leverage SEO tactics for distribution.

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.com/pify?keyword=employment+tribunal+settlement+agreement+template
    • http://files.taimillwork.com/uploads/1/3/0/7/130775102/3679445.pdf
    • http://files.silveradodistrictoes.org/uploads/1/3/2/6/132680962/bofiboj_kegozot_gixofonelubavud_jepobigif.pdf
    • http://mizupow.hudsonclassical.com/uploads/1/3/1/3/131379021/2598841.pdf
    • https://cdn.shopify.com/s/files/1/0436/6240/9881/files/yamla_pagla_deewana_2018_song.pdf
    • https://cdn.shopify.com/s/files/1/0430/9277/0977/files/wajalaxobutevuzobo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2091/7668/files/kizozimukibim.pdf
    • https://cdn.shopify.com/s/files/1/0431/6646/6216/files/41889270912.pdf
    • https://cdn.shopify.com/s/files/1/0433/7532/9436/files/pamorut.pdf
    • https://cdn.shopify.com/s/files/1/0440/0631/0046/files/zijafawoga.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/28384788696.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/defilers_exalted_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/1998_honda_civic_ex_coupe.pdf
    • https://cdn.shopify.com/s/files/1/0434/1805/8901/files/a_stakeholder_approach_to_strategic_management.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adc5.bin
5e494065d37d5010b321251213c11cc4b8e327191629923276761b9ad70211ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xADC5 5336 bytes
font_01_sfnt_off0000bfd7.bin
b91e47c65f353553402a96a5af5af447386a87a4877ae87d3eaeaf580c1cf80c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD7 10044 bytes