Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8a6438f1ed52b2…

MALICIOUS

PDF

41.4 KB Created: 2020-08-18 15:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 689311ea84c948135ea3bba7cd4dc836 SHA-1: f3ca2ddf4b6b8d02f1aa46eaae178285b332476c SHA-256: 6f8a6438f1ed52b2972ae15d12749a88ec9f8c13b12bbbf4ac774ca5ea9f3bd3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=pressure+ulcers+treatment+guidelines'. It also exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many of which point to Shopify domains. The document body, though heavily obfuscated, contains the same redirector URL and appears to be a lure related to medical treatment guidelines.

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=pressure+ulcers+treatment+guidelines
    • http://loxudon.greenecountyunitedway.org/uploads/1/3/1/3/131384495/zakuru.pdf
    • http://files.alleghanygrace.com/uploads/1/3/1/6/131606854/wakelirulo_dumakufen.pdf
    • http://files.electricpantz.com/uploads/1/3/0/8/130813881/8473985.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4120/1064/files/ragewuwotufivejifo.pdf
    • https://cdn.shopify.com/s/files/1/0438/5194/0000/files/figuziwesuxemefotumesuvoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/98199826998.pdf
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/ralotebolefuzez.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/8136140033.pdf
    • https://cdn.shopify.com/s/files/1/0432/7089/7824/files/fuzuvinokoraraponus.pdf
    • https://cdn.shopify.com/s/files/1/0436/2718/4281/files/1829825666.pdf
    • https://cdn.shopify.com/s/files/1/0441/1247/8360/files/78394136072.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/24950106242.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8487/files/joguwonug.pdf
    • https://cdn.shopify.com/s/files/1/0431/9087/8372/files/xowon.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/70680706676.pdf
    • https://cdn.shopify.com/s/files/1/0435/7881/8715/files/gta_v_emblems.pdf
    • https://cdn.shopify.com/s/files/1/0432/0791/7729/files/free_advanced_excel_tutorials.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_off000064b5.bin
2b416d60b5b7c8221b27391f4e5f6d3c01e6d41e576c0aeaf569c0f40416ed25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B5 5260 bytes
font_01_sfnt_off00007674.bin
4286e082fe6298d8cec01e9cd564fe773a61feb90d1b44ee0891ebbb577c986d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7674 10112 bytes

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