Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b55eb37add94a6a…

MALICIOUS

PDF

43.3 KB Created: 2020-08-22 14:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47d054136392b9e135500a33ec262e13 SHA-1: 805843352c2fcbefd305ce1bf3830abec1758659 SHA-256: 6b55eb37add94a6a82244fc6e1da307d1626d56f5847307106027392f5687fd4
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'leisure activities spanish worksheets' and the malicious URL, suggesting a lure to a content farm or phishing site. The ML classifier strongly indicated maliciousness, and the presence of many external links supports this assessment.

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=leisure+activities+spanish+worksheets
    • http://files.kathryndykstra.com/uploads/1/3/0/8/130874009/xetojez.pdf
    • http://vidobezaj.connollyspuppies.com/uploads/1/3/1/8/131872149/5631491.pdf
    • http://zurawo.saltcitydozen.com/uploads/1/3/0/8/130814297/nugovugekewer_jupipupipotiji.pdf
    • http://files.citycentrechurch.ca/uploads/1/3/1/0/131070112/d2032d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2370/3970/files/lelorinebotenore.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/13255509213.pdf
    • https://cdn.shopify.com/s/files/1/0436/1152/1187/files/donkey_kong_gba_roms.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7779/files/tinkers_construct_modifiers_1._12.pdf
    • https://cdn.shopify.com/s/files/1/0427/5562/1031/files/xasitidujut.pdf
    • https://cdn.shopify.com/s/files/1/0434/1855/0439/files/10th_new_syllabus_social_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nebedaxogatasimilore.pdf
    • https://cdn.shopify.com/s/files/1/0438/2015/5037/files/vebetunudijituxejamok.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/zuzezalozasafo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4225/7561/files/character_map_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/sawagamotunabuzagisexi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6448/2202/files/34329624859.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.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_off00006a7f.bin
26ff75fa906a3029884b9a365eb80429971ee8a9afdf3527283ed5d8bb09fde4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7F 5144 bytes
font_01_sfnt_off00007c0f.bin
bcccdca01e225d7c5fdd44f76c9a05b02a7c2a6fdf8efdd6dd68399ece1aa349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0F 10456 bytes

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