Malicious PDF — malware analysis report

Static analysis result for SHA-256 af85d0d16059f683…

MALICIOUS

PDF

37.1 KB Created: 2020-08-30 22:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdddcfcf7bf5f8eb94eb3769815236ce SHA-1: 06a60cb9ac49db973a171e5269ef070bc72468c4 SHA-256: af85d0d16059f683fa553cfcbaf773970d7d887c1323abf530136c2150cfdb25
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to external malicious content. The presence of numerous links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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/wix?keyword=factorisation+polynome+degr%25C3%25A9+2
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/97921739172.pdf
    • https://cdn.shopify.com/s/files/1/0435/2452/2143/files/bewitched_bothered_and_bewildered_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/6288/6549/files/schneider_switchgear_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0448/3717/5456/files/fmaj7_ukulele_chord.pdf
    • https://cdn.shopify.com/s/files/1/0437/5370/1525/files/synonyms_dictionary_for_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0429/8643/8807/files/40454992296.pdf
    • https://cdn.shopify.com/s/files/1/0430/9224/6685/files/azolla_in_rice_cultivation.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9447/files/munifo.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_off00004e27.bin
1fa652542f5629a2eb9e10ffac908157b9015dd978702088282c7447366b11c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E27 5724 bytes
font_01_sfnt_off0000614a.bin
67933e99be2b0d811c9f14213254c763b7e0a465624429970fce1926f2f80126		 pdf-font-stream PDF embedded font (sfnt) at offset 0x614A 11492 bytes

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