Malicious PDF — malware analysis report

Static analysis result for SHA-256 281d1f91cd51ae9d…

MALICIOUS

PDF

50.7 KB Created: 2020-08-31 02:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c20b2200806bb5e72ecd1174271f522 SHA-1: ae5a84ab0fba73af3a3cd6923349234f4876c338 SHA-256: 281d1f91cd51ae9dc4cc7796e022607786555210d47724fd97a16cb751cca2f5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=electro-voice+zlx-12p+manual'. This URL is likely used to direct users to malicious content. The document body, though heavily obfuscated, also contains this URL, reinforcing its role as a lure. The ML classifier also strongly indicated maliciousness.

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=electro-voice+zlx-12p+manual
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/risoga.pdf
    • https://cdn.shopify.com/s/files/1/0430/6567/1833/files/21832026561.pdf
    • https://cdn.shopify.com/s/files/1/0428/8610/3207/files/6603634320.pdf
    • https://cdn.shopify.com/s/files/1/0436/0755/6258/files/86037020160.pdf
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/sulomojelowak.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1303/files/32332117789.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/68403099501.pdf
    • https://cdn.shopify.com/s/files/1/0435/6381/0975/files/mivimugalov.pdf
    • https://cdn.shopify.com/s/files/1/0432/9721/0532/files/54840057873.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/cemu_gamepad_screen.pdf
    • https://cdn.shopify.com/s/files/1/0430/4093/1991/files/bipidag.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/viroxilo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/powugox.pdf
    • https://cdn.shopify.com/s/files/1/0435/0106/0262/files/biology_text_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7083/2291/files/vuxejaxubesikazezono.pdf
    • https://cdn.shopify.com/s/files/1/0435/8737/1171/files/lotaxodumuragoxawaleka.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/
    • https://cdn.shopify.com/s/fi

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e81.bin
c923b698e3454d7ffaaec2ae07906c4e2e4e014450c0897527381edb132456d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E81 5252 bytes
font_01_sfnt_off0000905c.bin
7d1d8f4167c36277c8fe71225fbdc31aaaca98204796b18c2f8b3e083a802a80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x905C 2048 bytes
font_02_sfnt_off0000993b.bin
240d176932e67b5a92592361f01cd44ffa5e4f6c2f0039243bf0ba9a0dee01f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x993B 10588 bytes

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