Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8920c9ce6acc80c…

MALICIOUS

PDF

43.0 KB Created: 2020-08-14 07:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0658e9e28102112218b492aa0d7fe1e SHA-1: 03c50797ffe45054d0f46561303da82506b3c41a SHA-256: f8920c9ce6acc80cec837753c0ad17f3ae84a7bcc4e456291dcea280c22d7d98
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains text related to newspaper articles and the redirector URL itself, suggesting a lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to potentially obscure the malicious destination.

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=newspaper+article+format+online
    • http://files.joanadler.com/uploads/1/3/1/8/131856391/6105094.pdf
    • http://xozoxeb.zushkabiros.com/uploads/1/3/2/3/132303382/xexelagufaz.pdf
    • http://files.approachapparel.com/uploads/1/3/1/3/131383664/8009279.pdf
    • https://cdn.shopify.com/s/files/1/0436/8809/9993/files/20981866780.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3208/files/popubagaginonobokopamaka.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/61131082743.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15501301831.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/the_very_hungry_caterpillar_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0430/7399/4905/files/5415897901.pdf
    • https://cdn.shopify.com/s/files/1/0448/0620/9702/files/d_d_5e_baldur_s_gate_descent_into_avernus_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/baritone_ukulele_fretboard_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0428/8171/2287/files/66096422375.pdf
    • https://cdn.shopify.com/s/files/1/0432/4291/3952/files/gopojowararexowugu.pdf
    • https://cdn.shopify.com/s/files/1/0438/6878/2757/files/2913778439.pdf
    • https://cdn.shopify.com/s/files/1/0435/9746/3714/files/52255065649.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_off00006b93.bin
a86d459cc0946c100d56a0299ac97f3b6a77a2c7126c71c8ca902e2282c0a3a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B93 5220 bytes
font_01_sfnt_off00007d4f.bin
fe0fd3d5f40828ceb3ae094d4001ff91deb4a137756718c165563d064fbcf097
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D4F 9952 bytes