Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec341d94a94ac8b…

MALICIOUS

PDF

36.1 KB Created: 2020-08-19 23:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88a0d54881668d7aaffc55ce8581e4fe SHA-1: dedcedf4f6d0831d8bf5e0ba045d63232d4ccffd SHA-256: 5ec341d94a94ac8b40e81ff3659091e64d6f63d3cc3b8e062bc6471d6fed6723
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious destination. The document body itself is heavily obfuscated but contains references to the malicious URL and other benign-looking PDF links.

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=cobit+2019+implementation+guide+pdf
    • http://files.takeaway.com.sg/uploads/1/3/0/9/130969220/3809082.pdf
    • http://files.adsgoround.com/uploads/1/3/1/4/131453894/gatolevexomanibafiso.pdf
    • http://files.latisserande.com/uploads/1/3/2/6/132681337/cc2f70dc8d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0909/7376/files/72629467318.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/general_chemistry_experiments.pdf
    • https://cdn.shopify.com/s/files/1/0447/0656/2201/files/brainstorming_methods.pdf
    • https://cdn.shopify.com/s/files/1/0432/4101/3412/files/98538778309.pdf
    • https://cdn.shopify.com/s/files/1/0431/7039/8362/files/lithium_evanescence_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/7168/4252/files/zeseki.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9799/files/kefejaxogekegeletupa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6404/9318/files/zagataxigowezaxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0460/8155/files/tizit.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/breatheology_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5964/1496/files/lesaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/45413501883.pdf
    • https://cdn.shopify.com/s/files/1/0432/2089/3864/files/materialism_terry_eagleton.pdf
    • https://cdn.shopify.com/s/files/1/0437/8217/6920/files/wilogabamosuwedo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5144/files/85066952279.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_off00004c8e.bin
3fb0b3a571908821317fed191c300feea2d40189905a9560fa4fa7f0d2fd6881		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C8E 5612 bytes
font_01_sfnt_off00005f91.bin
3c8a025515875ea25d08463647b3e01e6336474a9ef093f6ba96a1c13f5254a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F91 10136 bytes

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