Malicious PDF — malware analysis report

Static analysis result for SHA-256 8adf366ea385cc1c…

MALICIOUS

PDF

42.0 KB Created: 2020-08-07 15:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f139e9c757bb2b70c5bcb1026ff7d967 SHA-1: 851b0b426b26182e52e2933e40c3839b28616f90 SHA-256: 8adf366ea385cc1c69fe89dcfeaee4abae97a84201118b864de5b1f851ebbd1c
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with several links pointing to known malicious redirectors. The primary malicious URL identified is https://ttraff.ru/pify?keyword=hot+wire+anemometer+thermal+method+pdf. While many links point to benign Shopify domains, the presence of the redirector and the ML classifier's high confidence score indicate malicious intent. No scripts were extracted, and the document body is heavily obfuscated.

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=hot+wire+anemometer+thermal+method+pdf
    • http://files.roxybrownfashion.com/uploads/1/3/0/8/130813639/tesugez.pdf
    • http://ravedasor.edistoclemsonclub.com/uploads/1/3/0/7/130775997/noximokopevow_zexuv.pdf
    • http://files.themohicans.net/uploads/1/3/0/9/130969931/vexum_nakesegafukip_mivepivulewegev_kipodiru.pdf
    • http://files.historianstevecampbell.com/uploads/1/3/1/3/131382346/5141450.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/anche_in_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/povumad.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/19887168063.pdf
    • https://cdn.shopify.com/s/files/1/0431/8281/7441/files/best_annotation_app_ios.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66923604261.pdf
    • https://cdn.shopify.com/s/files/1/0428/2010/8455/files/78573218239.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/ruviraxopux.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/ziwobe.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/carranza_periodoncia_clinica.pdf
    • https://cdn.shopify.com/s/files/1/0433/1565/8920/files/wefuguwumaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7118/4794/files/17029603650.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6833/files/advantages_and_disadvantages_of_newspaper_advertising.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_off00006402.bin
6220717b0598d84e3a8da6549c4bfdee7bfc792cf876095418491ea816bec874
pdf-font-stream PDF embedded font (sfnt) at offset 0x6402 5156 bytes
font_01_sfnt_off00007571.bin
4449aefad07ae4bdf2b7ddb7c0348160cf8424343e6be17d7579483ca1cb2200
pdf-font-stream PDF embedded font (sfnt) at offset 0x7571 11132 bytes