Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0641dd8308b7bb4…

MALICIOUS

PDF

40.3 KB Created: 2020-08-25 05:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2af9bd991a39083d0f688eff6949f193 SHA-1: fb02795266c13acf3f4719998a5719aa2049972a SHA-256: b0641dd8308b7bb49a0c60b9330c0bc6e1848fa6450547a1e84b18f02e057daf
154 Risk Score

Malware Insights

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

The PDF file contains a link to a redirector URL, which is a common technique for delivering malicious content. The document body, though heavily obfuscated, contains the text 'C. o. full form in police' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous other links, many pointing to shopify.com, indicates a potential SEO poisoning or link farm strategy to increase visibility of the malicious 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=c.+o.+full+form+in+police
    • http://files.ruffwindsretrievers.com/uploads/1/3/1/4/131413718/9437101.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1700/files/pufuseser.pdf
    • https://cdn.shopify.com/s/files/1/0450/5577/0776/files/31402851527.pdf
    • https://cdn.shopify.com/s/files/1/0437/2283/4071/files/bupivilubetufiliduzo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/atmega8_pin_description.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/98649896158.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/mofogapidawizizuwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2645/files/adam_smith_economics.pdf
    • https://cdn.shopify.com/s/files/1/0432/6549/1107/files/19844847735.pdf
    • https://cdn.shopify.com/s/files/1/0432/2076/2783/files/pondicherry_road_map_city.pdf
    • https://cdn.shopify.com/s/files/1/0434/2792/2076/files/67006490994.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/fodukerofemizabupigizose.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5890/files/mujifadinuwu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7758/0453/files/transformations_of_trig_functions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0456/4221/9687/files/77732714693.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_off000061a0.bin
116a194e3b2ca17b13a6beac73035e7c36f70d4387c30f8df67d67956d787d30
pdf-font-stream PDF embedded font (sfnt) at offset 0x61A0 4712 bytes
font_01_sfnt_off0000718f.bin
5b32962b624d4eeb57e44b8105e0800b6aee77f4bf195af932b188712c777323
pdf-font-stream PDF embedded font (sfnt) at offset 0x718F 10332 bytes