Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a84a392d1f6ebc…

MALICIOUS

PDF

38.6 KB Created: 2020-08-21 20:40:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce59d5a92947be3dd61d6fc77bccff02 SHA-1: b156c99b6f85631dd83affa54d3e472bb4f2a9f3 SHA-256: e5a84a392d1f6ebce25f82fa3965d4ad3f04469fbf0b90c9b8564e3bc17f3f42
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic identifying a redirector to malicious infrastructure at `ttraff.ru`. The document body, though heavily obfuscated, contains text related to 'Boondocks season 4 subtitle' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly supports the malicious nature of this 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=boondocks+season+4+subtitle
    • http://files.misfitspolitics.com/uploads/1/3/0/7/130739060/wilew.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/dezejimasiwopobubidu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5929/0022/files/rosikusubofunovudup.pdf
    • https://cdn.shopify.com/s/files/1/0430/4440/5397/files/2144685629.pdf
    • https://cdn.shopify.com/s/files/1/0440/6873/3078/files/65438889151.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/xutufi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4365/8650/files/35418843005.pdf
    • https://cdn.shopify.com/s/files/1/0437/7670/4669/files/moponupidokopiluwoboba.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7588/files/zonim.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_off00005a53.bin
c9bb5d66fdfe9b8ba1df0fabc0f8fbfaa69cfde2ac49b1337714102757773591		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A53 5180 bytes
font_01_sfnt_off00006c02.bin
af5b5a9a5ead1633ae41ede6158f3fac57b15b4e6cdb0657d3df72ce8ecc9778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C02 10012 bytes

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