Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2d624d7ab0767c…

MALICIOUS

PDF

33.6 KB Created: 2020-08-29 18:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3934bf2a5b2624d93d0b317652ce0ee1 SHA-1: 08069e51decfa7aabe169d3156da9299329e89e8 SHA-256: 4b2d624d7ab0767c98a972cc69a3c8e8861f201598bbd88c0f485139dc9ae40b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, with one prominent link to a known malicious redirector at `ttraff.ru`. The document body, though heavily obfuscated, contains text related to a "paper bridge challenge" and the malicious URL, suggesting a lure to trick users into visiting the redirector. The ML classifier strongly supports the malicious verdict.

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=paper+bridge+challenge+pltw
    • https://cdn.shopify.com/s/files/1/0430/5407/1957/files/jominuvodisetoluzasob.pdf
    • https://cdn.shopify.com/s/files/1/0434/3142/8248/files/wonipuranijafufofedasew.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sesolofulazige.pdf
    • https://static.usrfiles.com/ugd/b8c837_83e7b438a15d4094861e66aa57458834.pdf
    • https://static.usrfiles.com/ugd/b8c837_928557fc88504efd843ea792ab26c7a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f40be5bc94947249c1abfbd6357f31e.pdf
    • https://static.usrfiles.com/ugd/b8c837_57d564a4fd134b08b55684e92cca70d1.pdf
    • https://static.usrfiles.com/ugd/64d889_c2aea396e16340158adc7f6b9f4d6745.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b2c943ef26d48498f2dfaad07d3bbb6.pdf
    • https://static.usrfiles.com/ugd/b8c837_db0f21ed758f4bd0b9a393ee819e4285.pdf
    • https://static.usrfiles.com/ugd/b8c837_778fabad083c45bcac7329df819bf7d4.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_off000047b2.bin
dad395509d9cc85f610fc9feb6f40e3e6fba37e45ad4317ed2fdade605460055		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47B2 5392 bytes
font_01_sfnt_off00005a04.bin
8b9c0a682158e206fde7c503975cf5bfb7646d0046953f5407969cb3fa7bd88d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A04 9360 bytes

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