Malicious PDF — malware analysis report

Static analysis result for SHA-256 8618950257c92cce…

MALICIOUS

PDF

40.8 KB Created: 2020-08-28 16:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dcbc59543fa3113c18bca02f0e890db SHA-1: 4cf20a84ffd21a709274059ec4b4c92b77ade659 SHA-256: 8618950257c92cce8e650aa0bd3d55e3ab159c0f864a65a884099278b0d35013
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the embedded URLs.

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=algoritma+geli%25C5%259Ftirme+ve+programlamay
    • http://files.nwpc-tx.com/uploads/1/3/2/7/132741225/mogudurexim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6654/0711/files/76099546460.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/puxazeru.pdf
    • https://cdn.shopify.com/s/files/1/0432/8652/8155/files/22794015661.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/pefajeza.pdf
    • https://cdn.shopify.com/s/files/1/0433/3430/3912/files/kafiwenib.pdf
    • https://cdn.shopify.com/s/files/1/0429/1015/4908/files/37550540679.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/lefilazafofe.pdf
    • https://cdn.shopify.com/s/files/1/0462/1303/8233/files/60943781294.pdf
    • https://cdn.shopify.com/s/files/1/0439/4277/2891/files/majuzafepuxemoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5032/7451/files/architectural_photography_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0436/5189/1358/files/surfside_tx_surf_report.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005de1.bin
6c13fc282c22daa6bc6bd5b3b4b7d0a0c525fdd25f6e4de4ddd34a28b5d28ba7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE1 5360 bytes
font_01_sfnt_off00007011.bin
49a4a124f1cfa8f1c47eaa9a65635bd757a3ed77ff3e878efb4f736e60006396
pdf-font-stream PDF embedded font (sfnt) at offset 0x7011 11540 bytes