Malicious PDF — malware analysis report

Static analysis result for SHA-256 60ab71e685299f41…

MALICIOUS

PDF

47.7 KB Created: 2020-08-21 23:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b30516cb24ee25c707ba870c5dd57092 SHA-1: 841086f8c4930a2ae1cefa2194abedfb3de9f147 SHA-256: 60ab71e685299f41e8a07252d9097e6fdd2f8ce208e292f7b04a489fad4f016e
154 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple links to external PDFs, including a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.ru'. This suggests the document is designed to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector URL is a strong indicator of malicious intent.

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=android+gamers+vs+ios+games
    • http://vakonow.doublejoutfittersny.com/uploads/1/3/1/6/131606271/2717341.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/61617743706.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0928/files/65293168946.pdf
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/jawobi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/24941471089.pdf
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/7475346995.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/26235185035.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/9236035702.pdf
    • https://cdn.shopify.com/s/files/1/0434/7379/7284/files/chennai_gana_sudhakar_song_masstamilan.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_off00007de4.bin
fdbe04fa0a40cab2b59cbd8fdda3e8781c47654ba0b6c4c6e6a555a4b9a67e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE4 5160 bytes
font_01_sfnt_off00008f5b.bin
f2103fe68e5d15b4bda19e857b5ba965655fab48b2a381d43cf75d8c66598788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F5B 10296 bytes

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