Malicious PDF — malware analysis report

Static analysis result for SHA-256 721ced5253e34d3f…

MALICIOUS

PDF

34.4 KB Created: 2020-08-08 14:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b06a876a46459a7250424a89c5f2370e SHA-1: 7c1cd59de7475a349c10f6dea2974a6c698781b8 SHA-256: 721ced5253e34d3f998fca7eccbf93dafc041494559faaa072e358043ea166f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits malicious behavior by containing a large number of external links, a technique often used for SEO spam or to redirect users to malicious sites. The primary malicious URL identified is 'https://ttraff.cc/pify?keyword=ceniza+de+cascarilla+de+arroz+pdf', which is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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=ceniza+de+cascarilla+de+arroz+pdf
    • http://nijajafig.troop167arlington-treasury.org/uploads/1/3/2/3/132303382/67b1cf62.pdf
    • http://files.laceyfisherlpc.com/uploads/1/3/1/4/131437005/nuvafegazo.pdf
    • http://files.nnhst2.org/uploads/1/3/1/3/131379612/lufuxofuwusuwufaposi.pdf
    • http://repositorio.usfq.edu.ec/handle/23000/6412
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/2199/7979/files/52534982394.pdf
    • https://cdn.shopify.com/s/files/1/0432/4635/4594/files/3356224866.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/66487120003.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/63890602632.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/83524260892.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/60200135148.pdf
    • https://cdn.shopify.com/s/files/1/0448/8429/5847/files/tanglewood_2020_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0429/0553/4620/files/electrical_engineering_hambley_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/39352037540.pdf
    • https://cdn.shopify.com/s/files/1/0440/0339/3694/files/rezalibodoruk.pdf
    • https://cdn.shopify.com/s/files/1/0431/5784/8224/files/25461767995.pdf
    • https://cdn.shopify.com/s/files/1/0447/1973/4938/files/javascript_find_object_in_array.pdf
    • https://cdn.shopify.com/s/files/1/0436/4481/3470/files/20594777872.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_off0000484c.bin
dc05a4c107f1bf522bdd3f31443fd8999438aab9c8c8d220b7a3e17cb5743c9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x484C 5104 bytes
font_01_sfnt_off000059bb.bin
271ce83ab2d9c3133f0a3b08c579e61c898da92246a9b3cd7304336f6707ae0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59BB 10200 bytes

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