Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74597f93795bf73…

MALICIOUS

PDF

36.1 KB Created: 2020-08-17 01:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8c78265e96df64abc29a8e921caf4cd SHA-1: b74dfa508d7e78702ace6e46523d5e63d6c78d1b SHA-256: d74597f93795bf73f13c79083ec89f3972808f14f003318d4f45e7f48bcacb4e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to `ttraff.ru`, identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm and a malicious redirector indicates the document's purpose is to lure users to potentially harmful sites.

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=bauman+capitalismo+parasit%25C3%25A1rio+pdf
    • http://files.bestpickeddiets.com/uploads/1/3/1/6/131606465/1a697.pdf
    • http://vemeneb.inearthenvessels.com/uploads/1/3/2/7/132740278/d8b777442c4.pdf
    • https://cdn.shopify.com/s/files/1/0437/5468/4565/files/47796134849.pdf
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/voxubetivuvi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2277/6480/files/buwejufepusirogilunev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72438278193.pdf
    • https://cdn.shopify.com/s/files/1/0432/7328/9888/files/tamufuxugepopizafez.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdf
    • https://cdn.shopify.com/s/files/1/0434/0927/7095/files/62608288346.pdf
    • https://cdn.shopify.com/s/files/1/0432/2587/4600/files/teguzizifurotajew.pdf
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/xifajopixe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0146/2436/files/finding_the_inverse_of_a_matrix_worksheet.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_off000049c6.bin
ccccbac049a090e3ad8f94c38b57a7f7508946454472af7cb3cadd1f6298a878		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49C6 5584 bytes
font_01_sfnt_off00005c14.bin
ef70491361b1409ee3928f2ef12d7938d75cbea3fe6375b7b485d801ac263ef7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C14 12164 bytes

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