Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24c6c1a8bb2c0c7…

MALICIOUS

PDF

42.9 KB Created: 2020-08-29 13:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8045787b09424a8a931d1edd69df198 SHA-1: 81e9fe9c94617904527c6d0e9421de47e793044f SHA-256: e24c6c1a8bb2c0c78dfce011d0f536eec296782b6472474001a42f2936f7b494
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=magic+blue+vacuum+parts'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'static.usrfiles.com'. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and other PDF links, suggesting a lure to external 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/wix?keyword=magic+blue+vacuum+parts
    • https://static.usrfiles.com/ugd/b8c837_8fb55a0add6e4304b3a96b56f0bdc8e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c90b5d5b093420bb5424da4e9ecb507.pdf
    • https://static.usrfiles.com/ugd/b8c837_03c10706f4274681a2791097c196dca5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c63fb67687a04688b2c9727766177a75.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a793dcd6ec041db9c7b166b37aaf74c.pdf
    • https://static.usrfiles.com/ugd/b8c837_68780f2a0bd846f2930ccf35a77f2cf1.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8180/files/39560116671.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/44557506646.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e7e3e65401943a5aa08e868718d254c.pdf
    • https://static.usrfiles.com/ugd/b8c837_20270b3f2a6b40f6bc5834ab91f0164d.pdf
    • https://static.usrfiles.com/ugd/b8c837_74f4684f5dc84c7a89e180f3b0e84c5b.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce63b69f24a0449dbed244ece44d484c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5423c5b111fe40129d672af19baa3b33.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_off000062b6.bin
91dd56b503a756f4ba5fe11f440339098f2a70052df63fafd7b691a6eaa66788
pdf-font-stream PDF embedded font (sfnt) at offset 0x62B6 5460 bytes
font_01_sfnt_off00007540.bin
0cecb350bf49fcae3c17fa3332db994a1cc1704c2349e1a9833a6a7d2a5eb424
pdf-font-stream PDF embedded font (sfnt) at offset 0x7540 12828 bytes