Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea558f01fa52676…

MALICIOUS

PDF

36.2 KB Created: 2020-08-01 23:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38f0ec23a4f9b47988f3392196112229 SHA-1: 7427066f86e408f00ff32da8380ddaec050ea098 SHA-256: 6ea558f01fa52676502d4a5a81515c8ba716d8a5a0824e24e5009732d8cbf061
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links to external PDF files, likely intended to create a link farm for SEO manipulation or to direct users to malicious content. One of the embedded links, https://ttraff.ru/pify?keyword=rosetta+stoned+tool, is identified as a malicious redirector. The ML classifier strongly indicated maliciousness, supporting the presence of these suspicious links.

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=rosetta+stoned+tool
    • http://files.maycontainnotes.uk/uploads/1/3/1/8/131856476/selixorada.pdf
    • http://files.techbenimble.com/uploads/1/3/2/6/132695535/jaxuzetorozet.pdf
    • http://files.jwshope.com/uploads/1/3/1/3/131383771/topenuzaloxusosaxupu.pdf
    • http://files.goepfertspeechassociates.com/uploads/1/3/0/9/130969048/jamufopinopi.pdf
    • http://files.zeenie.com/uploads/1/3/1/4/131453151/funatavad-luvez-luxenud-buwidasimudo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1568/3744/files/kuzebejodebojub.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/rovufimopotipexulipo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/92323436584.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/wiliw.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/tupefevanopijigifelusa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7088/1946/files/tuvuvexunubevizegosej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69440205977.pdf
    • https://cdn.shopify.com/s/files/1/0432/0909/7384/files/zoxisotebifewabujewoze.pdf
    • https://cdn.shopify.com/s/files/1/0429/2873/4367/files/the_business_school_by_robert_kiyosaki.pdf
    • https://cdn.shopify.com/s/files/1/0435/7367/4142/files/58443516853.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58143530911.pdf
    • https://cdn.shopify.com/s/files/1/0436/4769/7056/files/weather_and_climate_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8673/files/xozar.pdf
    • https://cdn.shopify.com/s/files/1/0435/6725/1617/files/87732211862.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051d7.bin
6795f0ee975a3cf8e787e96488cf95e03ad3e9f9c7f6e92de04a43ba7c452229		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51D7 4732 bytes
font_01_sfnt_off00006202.bin
0bde6d62311aabe8b208e228f50efb657b0e5539af352396c3914adb314ce206		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6202 9964 bytes

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