Malicious PDF — malware analysis report

Static analysis result for SHA-256 220690db81cafbca…

MALICIOUS

PDF

44.1 KB Created: 2020-08-10 20:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a6a243e7a24c804b6e33f39fddc6ddc SHA-1: 2ea91a001ee59eb370a8d3b4084b988db47f1435 SHA-256: 220690db81cafbcab1f9f9567149acb6dab808b77e13bfb9673f6a1de0d260f1
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, specifically pointing to 'https://ttraff.ru/pify?keyword=buat+cv+di+pdf'. This URL is presented within the document body, disguised as a link to create a CV. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains, but one critical link to the malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=buat+cv+di+pdf
    • http://files.lasttimetheywon.com/uploads/1/3/2/6/132682070/nelamunidovugusiju.pdf
    • http://files.westernpromenaders.com/uploads/1/3/1/4/131438069/6640258.pdf
    • http://kiramibop.livewireagility.com/uploads/1/3/0/7/130776485/kibomu-fomovogofetisut-ranemurogaro.pdf
    • http://files.spectrian.net/uploads/1/3/2/7/132712358/xogozunifovaremidora.pdf
    • https://cdn.shopify.com/s/files/1/0435/4310/1591/files/306200202.pdf
    • https://cdn.shopify.com/s/files/1/0451/9621/4423/files/biomedical_waste_management_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/27722111220.pdf
    • https://cdn.shopify.com/s/files/1/0431/7662/4279/files/99696490282.pdf
    • https://cdn.shopify.com/s/files/1/0438/1471/5554/files/conundrum_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/9386/1279/files/tosuvimakezapabikof.pdf
    • https://cdn.shopify.com/s/files/1/0434/1045/6726/files/solving_linear_equations_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9921/0407/files/tamadufa.pdf
    • https://cdn.shopify.com/s/files/1/0438/5495/4656/files/cdna_synthesis_kit.pdf
    • https://cdn.shopify.com/s/files/1/0430/0383/8615/files/62513689700.pdf
    • https://cdn.shopify.com/s/files/1/0429/5111/4908/files/sekiro_grave_wax.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_off00006f2e.bin
41c8cec9f5605cdb77ac8907cf234e5260bdae8815d783fe887b6602cef0857a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2E 4952 bytes
font_01_sfnt_off00008024.bin
e6b1c2d019fa137d26bebb534d4cc596b2d2e505d9b3007500723395e3af91b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8024 10380 bytes