Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9a2b9faec92d7d…

MALICIOUS

PDF

39.1 KB Created: 2020-08-06 19:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3bf031a96d91b43f9fbd9132261e027 SHA-1: 04355e142f7b741e12777efa3ae934fb42b6d1d8 SHA-256: ef9a2b9faec92d7d145c0708713eccf114270f36bd44ed2d3c78676fc81c78ea
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, many hosted on Shopify, forming a link farm. One of these links, https://ttraff.ru/wb?keyword=silvicultura%20em%20mocambique%20pdf, points to known malicious redirector infrastructure. This suggests the document is designed to lure users into clicking malicious links, likely for phishing or to download further malware. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=silvicultura%20em%20mocambique%20pdf
    • http://files.bolddiscipleship.com/uploads/1/3/1/3/131398541/korokizanuvuvir.pdf
    • http://files.thebrmichaels.co.nz/uploads/1/3/2/7/132740805/zurasiza.pdf
    • http://files.plumblossomtaichi.ca/uploads/1/3/2/7/132740778/4504037.pdf
    • http://files.piasiagallery.com/uploads/1/3/1/8/131856358/pelevixibujova_ximewusodo_jumuwakofidewu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1853/4557/files/96463864018.pdf
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/16809905340.pdf
    • https://cdn.shopify.com/s/files/1/0432/7496/1059/files/460863134.pdf
    • https://cdn.shopify.com/s/files/1/0436/0234/6148/files/64881637296.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2791/files/trigonometry_and_analytic_geometry_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/25862542558.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/gagironixedaneno.pdf
    • https://cdn.shopify.com/s/files/1/0439/4795/0248/files/pikukozugawerugofifixafe.pdf
    • https://cdn.shopify.com/s/files/1/0449/3859/2424/files/wordly_wise_3000_book_5_lesson_1.pdf
    • https://cdn.shopify.com/s/files/1/0437/3463/0549/files/xokatem.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_off00005665.bin
16347a5036b08c3ffb2a61048221dbc6cfb8efbb022cd831a67cb8ac80468f0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5665 5552 bytes
font_01_sfnt_off00006932.bin
898758b09678cf632e57d8497de6f790529382b34938d620186023d64dd77aae
pdf-font-stream PDF embedded font (sfnt) at offset 0x6932 12172 bytes