Malicious PDF — malware analysis report

Static analysis result for SHA-256 06e8c18575a7f4c2…

MALICIOUS

PDF

56.0 KB Created: 2020-08-06 17:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6406a90f8e847829fd1112064f362fdb SHA-1: 27a804f89dc64b7475188c7548f0bb2650dfdea4 SHA-256: 06e8c18575a7f4c2eee1b756af34d0369f5992a181836c5463bbc8e16e15430e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=non+linear+op+amp+circuits+pdf'. It also exhibits characteristics of a PDF SEO link farm, embedding numerous external links, many of which point to Shopify-hosted PDFs. The ML classifier strongly supports the malicious nature of this document. The primary attack pattern involves luring users to malicious sites through a deceptive link farm.

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=non+linear+op+amp+circuits+pdf
    • http://files.rallypointdefense.net/uploads/1/3/1/0/131070979/zizuwoferek-dotewufolib.pdf
    • http://files.timballintine.com/uploads/1/3/2/7/132741556/sedajixatotez.pdf
    • http://volarovo.fairytale-wedding.ca/uploads/1/3/1/8/131857631/1156315.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7562/4350/files/fafoxodexijiviribezubudub.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/audacity_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/2827/4585/files/32891563298.pdf
    • https://cdn.shopify.com/s/files/1/0435/6413/8651/files/timesheet_html_code.pdf
    • https://cdn.shopify.com/s/files/1/0437/1103/7591/files/newly_wed_question.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8573/files/53143592952.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/bobadam.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2106/files/79311435375.pdf
    • https://cdn.shopify.com/s/files/1/0431/5407/9904/files/71484001978.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/wokedokozugamajo.pdf
    • https://cdn.shopify.com/s/files/1/0439/6482/5758/files/jawujovugenimod.pdf
    • https://cdn.shopify.com/s/files/1/0434/1979/5623/files/ways_of_avoiding_plagiarism.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086dc.bin
940da1a5cd2226fb74a091b578f83e969fe6a87be50fe56024137ce7eb9778ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86DC 5268 bytes
font_01_sfnt_off000098b6.bin
b3c6ed328f415157783be91e70c9f170937a526a5383804467cfefcce23d8318		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98B6 10600 bytes
font_02_sfnt_off0000bd2f.bin
38ab3b6e1373322576ef863e3e3d947aebab070a98faddc61da3b73100a67b84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2F 16308 bytes

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