Malicious PDF — malware analysis report

Static analysis result for SHA-256 d493c4f150b6ba5e…

MALICIOUS

PDF

40.9 KB Created: 2020-08-23 16:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20348f98b5833b2983ba2997be6a5bdd SHA-1: 1b0a9dcde58d7f04625b19ced1b01157cb0a4af1 SHA-256: d493c4f150b6ba5efc271dae1efc1e047b4df5742001a618b2201336a57aa1cb
154 Risk Score

Malware Insights

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

The PDF document is designed as a lure, promising interview-related content to entice users. It contains embedded links, with one pointing to a known malicious redirector at 'ttraff.ru'. Additionally, it features a link farm with numerous PDF links, many hosted on Shopify, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness.

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=interview+questions+and+answers+for+marketing+assistant
    • http://files.elambaptistchurch.net/uploads/1/3/1/3/131378918/85c49b0.pdf
    • https://cdn.shopify.com/s/files/1/0439/0594/1672/files/22450645881.pdf
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/42961945730.pdf
    • https://cdn.shopify.com/s/files/1/0440/2741/2645/files/56022415775.pdf
    • https://cdn.shopify.com/s/files/1/0429/8126/1466/files/pathfinder_core_rulebook.pdf
    • https://cdn.shopify.com/s/files/1/0440/2456/1829/files/au_bonheur_des_dames_emile_zola.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6384/files/71824502676.pdf
    • https://cdn.shopify.com/s/files/1/0432/2151/6449/files/4228993799.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6729/files/judegezujozajazek.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_off00006237.bin
88c26b6aa0d883ebbf0221a6b27e912f0806bd8517f081a76a91e26c07dcba96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6237 5472 bytes
font_01_sfnt_off000074cf.bin
98839b9b4a1f891f1be955261102f71f5613467c58998ede177c4ba9a74f7647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CF 9976 bytes

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