Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b949063df4eb3d0…

MALICIOUS

PDF

52.4 KB Created: 2020-08-12 03:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b197c8f81d870c035352ffcfc79247e SHA-1: f65b97d0a6e79dce18d7f24b2978260965411248 SHA-256: 5b949063df4eb3d03ef5fac14a8a1206088489d249514bfd6fb54bb533b17d63
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of embedded links, many pointing to Shopify domains, but crucially includes a link to a known malicious redirector at `https://ttraff.ru/wb?keyword=asynchronous%20and%20dc%20machines%20pdf`. This suggests the document is designed to redirect users to malicious infrastructure, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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=asynchronous%20and%20dc%20machines%20pdf
    • http://files.altrusaofgadsden.com/uploads/1/3/1/0/131070302/lupemazerok-dulanefojofow.pdf
    • http://files.ptkranch.com/uploads/1/3/1/6/131606965/fadezujeno.pdf
    • http://files.barbaraweikamp.com/uploads/1/3/2/6/132695805/b6108e1.pdf
    • http://files.gumbauctionandrealty.com/uploads/1/3/2/7/132740435/gisukituk_wiwidulixejisav_siwimejuvep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/17623877759.pdf
    • https://cdn.shopify.com/s/files/1/0430/9775/1709/files/andrei_deiu_training_program.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/gavolufe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/11133270424.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/zezetekuka.pdf
    • https://cdn.shopify.com/s/files/1/0428/2925/0719/files/tevifejevubafataxonujef.pdf
    • https://cdn.shopify.com/s/files/1/0433/9440/0423/files/66382067615.pdf
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/4617805844.pdf
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/nanekibitoga.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ae0.bin
718e342d0f34298ef5fb84df29e0daae7c35e9c9a35bf90c06b6f4b6be68081a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE0 5456 bytes
font_01_sfnt_off00008d3f.bin
f3023c0e144c5980cc6a361dfee087f27b7209ae35ee819ab2d7fef362bc00fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D3F 10072 bytes
font_02_sfnt_off0000afc1.bin
ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC1 16060 bytes

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