Malicious PDF — malware analysis report

Static analysis result for SHA-256 8601e3c7313114af…

MALICIOUS

PDF

45.9 KB Created: 2020-08-21 14:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b7a9e6a5d6e70df389517af99cff023 SHA-1: bd19ed8c744a8cf0dc0c29a43a736e16b1378ac0 SHA-256: 8601e3c7313114afd121c67ba615ca307404cff1e8d10a704eb046c0a3595966
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that is likely part of the malicious redirection chain. The presence of numerous links suggests an attempt to lure users to external sites for phishing or malware delivery.

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.cc/pify?keyword=assembler+jpeg+en+pdf+mac
    • http://bufifeb.aalumber.com/uploads/1/3/0/7/130776493/vazixaxegel.pdf
    • http://files.rileycountycommunityneedsassessment.org/uploads/1/3/1/1/131164211/c024ed8.pdf
    • http://files.claregriffin.org/uploads/1/3/0/7/130776519/juwoseropeziw_xotusizo_lixarixiwav_wuwovikofi.pdf
    • http://zogineje.mobilephlebotomynorthcarolina.com/uploads/1/3/1/4/131406390/xifutaxolatago.pdf
    • http://files.bigloveletters.net.au/uploads/1/3/1/4/131453036/41e2cb451d1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5567/6568/files/60993824925.pdf
    • https://cdn.shopify.com/s/files/1/0434/2281/0263/files/mubuwagudulaso.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/43718615549.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/zumdahl_chemical_principles_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/4539/5359/files/sipojamefux.pdf
    • https://cdn.shopify.com/s/files/1/0437/2607/8106/files/corrugated_paper_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/starting_a_coffee_shop_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0437/2486/5685/files/convert_mixed_numbers_into_improper_fractions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8250/files/zedaviwidoropuposarifar.pdf
    • https://cdn.shopify.com/s/files/1/0438/4319/0946/files/accounting_information_systems_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/20732345455.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3453/files/demand_driven_material_requirements_planning_ddmrp.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_off00007455.bin
b733a859fe3b8a7e99ab93175bf2fbe49fe05cdcbfbfa09b4438d62cdd90dc10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7455 5680 bytes
font_01_sfnt_off00008784.bin
fcc5d5cfb2dfe9c3af31b2c3ac67ad906be1ea993b11798c8f34a3570e2ca082		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8784 10212 bytes

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