Malicious PDF — malware analysis report

Static analysis result for SHA-256 0791d2434e79ad1b…

MALICIOUS

PDF

46.1 KB Created: 2020-08-17 02:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93715e68c73f37886805397cdf63e146 SHA-1: f8d95e92237452821b33d9b77d2d3740f05fc4d2 SHA-256: 0791d2434e79ad1bbcb30f84f618c9cef581fd4db23bde030c460583c4d6e071
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/pify?keyword=android+auto+vs+apple'. Another critical heuristic indicates a PDF link farm with 26 external PDF links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of the malicious redirector and the link farm suggests an attempt to direct users to malicious content or manipulate search engine results.

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=android+auto+vs+apple
    • http://files.edinburghlets.org/uploads/1/3/0/8/130814706/xamosadurokeb-rapaxizumidadub.pdf
    • http://files.middlefieldny.org/uploads/1/3/0/9/130969631/mubelapawo_mopovojisokokol_poxodulokoz.pdf
    • http://files.siliconvalleybollywood.com/uploads/1/3/1/3/131379113/1096929.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/3537/3213/files/killing_the_black_body_chapter_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/10452507035.pdf
    • https://cdn.shopify.com/s/files/1/0437/2175/2726/files/pifonimosijewalevejaraxi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5949/4555/files/64498129776.pdf
    • https://cdn.shopify.com/s/files/1/0429/2139/4343/files/artificial_intelligence_a_modern_approach_github.pdf
    • https://cdn.shopify.com/s/files/1/0432/1076/8546/files/tesomukudex.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0471/files/zonitokujagabaxezof.pdf
    • https://cdn.shopify.com/s/files/1/0437/6641/5514/files/gedux.pdf
    • https://cdn.shopify.com/s/files/1/0431/3382/9277/files/luzemevipezugate.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9697/files/army_mission_java_games.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_off00006b70.bin
f85d16e8510fe4686939e28314cbf013313c77983d9bd9fd99e4243ca223d631
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B70 5000 bytes
font_01_sfnt_off00007c82.bin
84d5a6887e42bcd4f3c9879c44a9fea00350d09531f03abc55ec2c98420783ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C82 15240 bytes