Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eec73b17e072fa1…

MALICIOUS

PDF

46.2 KB Created: 2020-08-18 15:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3478f5b83b23cb26b18e4675a1e03a39 SHA-1: f690340e275007bc7faf00ebfa815f7570f6000a SHA-256: 1eec73b17e072fa1fed36ea56dfce4a5e8a4843696bd927ad9eae2c0632a2321
152 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/pify?keyword=focus+group+interview+guide+template'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0428/6296/8991/files/16484166949.pdf'. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially corrupted, contains the same redirector URL.

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=focus+group+interview+guide+template
    • http://files.elizabethbernays.com/uploads/1/3/0/7/130739712/pewolobo.pdf
    • http://files.nlbeekeeping.com/uploads/1/3/1/3/131383934/likaxizilopux-lolinituboreva.pdf
    • http://files.mekongtimberplantations.com/uploads/1/3/1/3/131384789/jewej-zetosifema-nogixuru-losagar.pdf
    • http://keweje.stephenkozan.com/uploads/1/3/1/4/131406082/6059260.pdf
    • https://cdn.shopify.com/s/files/1/0428/6296/8991/files/16484166949.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1111/files/changeling_the_lost_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/maruxemofazetotorazebe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/kipaxanuduvojawa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6965/files/82590365777.pdf
    • https://cdn.shopify.com/s/files/1/0434/6553/9741/files/ernesto_che_guevara_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/6018/2692/files/labobopidaluzekotori.pdf
    • https://cdn.shopify.com/s/files/1/0432/7034/0772/files/zidomunulijozamiruxonis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riwemabosemuridaredexe.pdf
    • https://cdn.shopify.com/s/files/1/0427/8570/2054/files/86673460891.pdf
    • https://cdn.shopify.com/s/files/1/0430/3516/4835/files/pojikavulotexirej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006949.bin
36fcbadac669db136b44375f7d509ed8c69261a691c97c52499d38502f223713		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6949 5384 bytes
font_01_sfnt_off00007b8c.bin
ac42d650082f769f98a875315e1f5a4d94b336fd32962ae76fe88ae8166d913b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8C 9804 bytes
font_02_sfnt_off00009d2d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D2D 4324 bytes

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