Malicious PDF — malware analysis report

Static analysis result for SHA-256 271f3faeaf51ba19…

MALICIOUS

PDF

41.5 KB Created: 2020-08-21 22:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea2080daa2845003376ea61d093546b8 SHA-1: 7ba31e2065fdd826cdcd8f7bbcd48c7e4e7070ae SHA-256: 271f3faeaf51ba19b190057a3aedbdd9fee954628a276bb299260bf55f6bf1ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains the URL 'https://ttraff.ru/pify?keyword=android+studio+theme+editor+not+available', suggesting a lure to a malicious site. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting 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=android+studio+theme+editor+not+available
    • http://muwebe.hrmattersottawa.com/uploads/1/3/0/7/130775934/livewojipijob.pdf
    • https://cdn.shopify.com/s/files/1/0435/9467/8435/files/8561900343.pdf
    • https://cdn.shopify.com/s/files/1/0433/1352/8987/files/mobija.pdf
    • https://cdn.shopify.com/s/files/1/0440/7607/3125/files/arithmetic_sequence_practice_problems.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9863/files/45896363722.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/42266466492.pdf
    • https://cdn.shopify.com/s/files/1/0431/8730/6658/files/tuscan_house_plans_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4167/6694/files/48140899834.pdf
    • https://cdn.shopify.com/s/files/1/0433/7955/6504/files/talejiwiwefokomasijodonem.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5622/files/4668895012.pdf
    • https://cdn.shopify.com/s/files/1/0429/0147/1388/files/78851446701.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_off000064c8.bin
36b98831da51feed62f258746d37be7a03940255101617b56b74b543a69d89e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x64C8 5252 bytes
font_01_sfnt_off00007678.bin
4ca73e71ace9fcf13c941d413b29636da5e0fe90eb4642f757f347b1abe6ab81
pdf-font-stream PDF embedded font (sfnt) at offset 0x7678 10252 bytes