Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff5de963f28e907…

MALICIOUS

PDF

49.8 KB Created: 2020-07-31 12:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3804157a811dd073ace9b8a0e45dec93 SHA-1: 6cc5b6f490ca26a7f8f52b277bb9ae8d5f95d4e0 SHA-256: 5ff5de963f28e9075118e44422f2ef85cae17c7d011d9f36cb432bf0211b7a75
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous links suggests a phishing or scam attempt, likely using the 'animation drawing books' lure to mask 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.com/pify?keyword=animation+drawing+books+pdf
    • http://files.wallartandpresents.co.uk/uploads/1/3/1/3/131379761/gedotubuvezu.pdf
    • http://files.wildroseeducation.com/uploads/1/3/0/9/130969616/nesetobexa.pdf
    • http://files.huyettm.net/uploads/1/3/0/9/130969703/kulevizozade.pdf
    • http://files.malcolmcounseling.com/uploads/1/3/1/3/131398164/2014036.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/sawerilaweru.pdf
    • https://cdn.shopify.com/s/files/1/0431/4185/7448/files/48969985885.pdf
    • https://cdn.shopify.com/s/files/1/0430/8559/4775/files/1938724249.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rosetotirumeza.pdf
    • https://cdn.shopify.com/s/files/1/0435/9992/1315/files/91497164283.pdf
    • https://cdn.shopify.com/s/files/1/0431/3789/2509/files/43636111495.pdf
    • https://cdn.shopify.com/s/files/1/0429/8647/1587/files/70197898164.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4301/files/pokerexekuni.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/84943088959.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39858795743.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31492874922.pdf
    • https://cdn.shopify.com/s/files/1/0440/1384/6693/files/73986179863.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39843759369.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_off00008630.bin
4a43e00dd69c22cb4fd72fec3263f6d3123586f770174af7a1f449cfbdbed544		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8630 5284 bytes
font_01_sfnt_off00009811.bin
68753aae4d83aae9ef6ce6ed0f31ad3ca89e3e1d9d7ced9a4bb5c00e90660412		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9811 10028 bytes

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