Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a185004e667a6e1…

MALICIOUS

PDF

54.9 KB Created: 2020-08-09 21:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c80e525fbc65d8d186535d7c828cc354 SHA-1: a3ac7e9e1281cb4428e0d74feb97fc07ff522377 SHA-256: 3a185004e667a6e1778404d3871b4d2c8f8de8313181291cdc73379c60957911
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. It also features a large number of external PDF links, a common SEO spam tactic. The document body contains obfuscated text and URLs, suggesting an attempt to disguise its malicious intent. The primary malicious URL identified is https://ttraff.ru/pify?keyword=barbituricos+farmacos+pdf.

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=barbituricos+farmacos+pdf
    • http://files.awakeningstaryoga.com/uploads/1/3/1/3/131380292/redafo.pdf
    • http://files.rugbyfootball.com/uploads/1/3/1/6/131607407/2dd90de641292.pdf
    • http://files.madisonbizreview.com/uploads/1/3/0/7/130739525/bevajukani.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/vupik.pdf
    • https://cdn.shopify.com/s/files/1/0437/6281/1031/files/freundlich_adsorption_isotherm.pdf
    • https://cdn.shopify.com/s/files/1/0437/4993/3208/files/33034405127.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/83693519709.pdf
    • https://cdn.shopify.com/s/files/1/0432/6011/7160/files/wufelelozinolavokideb.pdf
    • https://cdn.shopify.com/s/files/1/0431/2688/2471/files/fanuwilazixa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8387/files/foxomudagepi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/85034265648.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27055139941.pdf
    • https://cdn.shopify.com/s/files/1/0436/0847/3763/files/44368098362.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_off000098f9.bin
1977aebd04ac8981947aa48687491e267435f7aa30b635ee22885b097c188235
pdf-font-stream PDF embedded font (sfnt) at offset 0x98F9 5456 bytes
font_01_sfnt_off0000ab6e.bin
634aaf659a997f1faccea3aea22b26abccfd7e00126f3f10640624533e48bc63
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB6E 10504 bytes