Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea7e9be0372588e…

MALICIOUS

PDF

41.5 KB Created: 2020-08-05 16:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61315702c12ba159bc3c1891e9147da9 SHA-1: 4d378423e2d507285ab163273030c81d967f39a4 SHA-256: 5ea7e9be0372588e43ac58999e8a1e3174f916a46f58b01002ab1ca68432c593
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to shopify.com domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=alzheimer+canino+pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and appears to contain the malicious URL, indicating the primary purpose is to redirect 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/pify?keyword=alzheimer+canino+pdf
    • http://files.veteransfurniturecenter.org/uploads/1/3/0/9/130969418/6556847.pdf
    • http://files.undividedla.com/uploads/1/3/0/7/130775588/9180423.pdf
    • http://files.veteransdayindy.org/uploads/1/3/2/8/132815767/kotutulew.pdf
    • http://files.aplmuseumpasses.com/uploads/1/3/1/4/131406412/7724621.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/jixibuke.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/21366654335.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5577/files/mizegovorawibufinipedu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0501/6226/files/tenurar.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3232/files/vizuvivurarawuguluj.pdf
    • https://cdn.shopify.com/s/files/1/0439/0033/8331/files/42883088395.pdf
    • https://cdn.shopify.com/s/files/1/0440/1309/3029/files/asma_ul_husna_arabic.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8586/files/digestive_system_of_earthworm.pdf
    • https://cdn.shopify.com/s/files/1/0437/8309/4434/files/67622504084.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fufalelavajukunegaxiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/2830/6341/files/fuvewotagebeji.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/55350275798.pdf
    • https://cdn.shopify.com/s/files/1/0436/9242/5384/files/gabipejapajapesibox.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_off000064ef.bin
4c0c368e13e1060e2d11ccac9d527a58863d20700f8892fe9df3af12c68d2aca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64EF 5256 bytes
font_01_sfnt_off000076ac.bin
58b8d1d83e995ebd7f72b5c3ab098b00593cf48d3c79a263a3e3aa4619c4c3bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76AC 10180 bytes

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