Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d805de60bf39e7…

MALICIOUS

PDF

42.7 KB Created: 2020-08-08 02:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36358cb3ef14f6a65c2c545154b5a8a1 SHA-1: 0ff6cd20f38853940774d200c8b3beadd44bb652 SHA-256: c7d805de60bf39e75ebf9a7a3119a1d188de9fcb523ae79d535d588c3d5a1d0a
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a Canada work permit application form. The document also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic to attract victims. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to malicious 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=canada+work+permit+application+form+download+pdf
    • http://files.chattanoogacrawlspaceencapsulations.com/uploads/1/3/1/8/131856191/f9c1936229fa.pdf
    • http://wezanex.concertinaman.net/uploads/1/3/0/7/130740510/sozez.pdf
    • http://files.innovativefinancialresults.com/uploads/1/3/1/0/131070911/2991001.pdf
    • https://cdn.shopify.com/s/files/1/0434/0082/2934/files/58151191820.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/85368919113.pdf
    • https://cdn.shopify.com/s/files/1/0431/2373/6725/files/precalculus_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/59138301364.pdf
    • https://cdn.shopify.com/s/files/1/0430/4368/4503/files/wewilozimojes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13121593915.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/tetuwudibuwesovunokamus.pdf
    • https://cdn.shopify.com/s/files/1/0428/7044/0095/files/fivotegexuputomevapitata.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13908697451.pdf
    • https://cdn.shopify.com/s/files/1/0429/3623/8236/files/soletalerixirav.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4853/files/69238144399.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/nazexubir.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/suwomogipe.pdf
    • https://cdn.shopify.com/s/files/1/0437/3456/5025/files/vigifarir.pdf
    • https://cdn.shopify.com/s/files/1/0432/3259/2040/files/4178114787.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_off000069cb.bin
10c16a770ca255ba2efe850094f760909a8564f2e2179be6cc0d38406b7d6246		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69CB 5184 bytes
font_01_sfnt_off00007b71.bin
9eab13eb0055a88a2b4273c397e1e4369aed8af1e7aba526a4e3da1d93a02d15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B71 9844 bytes

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