Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f62481c0aafa8dc…

MALICIOUS

PDF

42.1 KB Created: 2020-08-26 18:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f71188c49a1b0c211376a9a1f0ffa281 SHA-1: 65e9eaf23210f5ec8ecc8e37c2ee205f3ebc6c46 SHA-256: 6f62481c0aafa8dcbbb6366c2ab0c8ae3613f84a62b8a04480c3920370e3e495
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a search result for 'Skyrim light armor perks', suggesting a lure to attract users. The presence of multiple external links, including one pointing to a known malicious redirector, indicates an attempt to direct users to potentially harmful content.

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=skyrim+light+armor+perks
    • http://duwegom.christinezoppi.com/uploads/1/3/1/4/131453494/pexubiwozupemuz_meriseniferupik_jutizif.pdf
    • http://files.heartsofhorsehaven.org/uploads/1/3/0/7/130775921/titasidudotop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6410/6901/files/40813693105.pdf
    • https://cdn.shopify.com/s/files/1/0435/5126/0836/files/acceleration_worksheet_answers_with_work.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/jowedoniwagup.pdf
    • https://cdn.shopify.com/s/files/1/0434/5584/0409/files/kifopofenaxefozavaloz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8827/2807/files/fasb_133.pdf
    • https://cdn.shopify.com/s/files/1/0436/3714/5753/files/1006451871.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/51887184018.pdf
    • https://cdn.shopify.com/s/files/1/0431/3353/4357/files/57624912751.pdf
    • https://cdn.shopify.com/s/files/1/0437/4626/3201/files/2191451489.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_off000066ce.bin
a5228ae2eefa68ab0b2ca43cb67c4eba16ad40a2f42c4ae787db7cf63b8dfe77
pdf-font-stream PDF embedded font (sfnt) at offset 0x66CE 5504 bytes
font_01_sfnt_off00007960.bin
76bc80c372c4eae6e2f989a504ae30e5570a622419ba8d3ff8c7900279edef96
pdf-font-stream PDF embedded font (sfnt) at offset 0x7960 10236 bytes