Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a95623ed7ed2dd…

MALICIOUS

PDF

43.9 KB Created: 2020-08-18 22:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32254776524e2e49c14ca9eb464f3b8b SHA-1: 2599c48580c2b169c28776dfdcce25f4110a7f68 SHA-256: 04a95623ed7ed2dd27be6dbd7bd6cfb8b16a85c1827fa3f7e2b917b4604bc5c2
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external PDF files, suggesting a link farm for SEO manipulation or to host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, which leads to the URL 'https://ttraff.ru/pify?keyword=best+air+fryer+review+consumer+reports'. The document body, though heavily obfuscated, also contains this URL and other PDF links, indicating an attempt to disguise malicious activity as legitimate content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=best+air+fryer+review+consumer+reports
    • http://jimuwepo.tsfabricator.com/uploads/1/3/0/9/130969723/jerizigo.pdf
    • http://tibiboxa.bloomingtoncenterformindfulness.com/uploads/1/3/0/8/130874493/a62fa329024ca.pdf
    • http://files.burgerclubdubai.org/uploads/1/3/0/7/130775727/dutoxim-bokosiwefaxuliz.pdf
    • http://vexif.verticleorigin.com/uploads/1/3/1/3/131380275/vukatej-kamixakufe-zovufu.pdf
    • http://files.pixiecovers.com/uploads/1/3/1/3/131380042/rafetapelufonof_jizonusezoledem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/feveliranokomibotivo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2332/files/nabujawawavitaxojibolaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2363/8426/files/16137311424.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5708/files/gobewamebibuxof.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8241/files/21773417050.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/mapejalusedasuxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8121/1802/files/69350779481.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/foxejuwasujexurexi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/kuvujabejune.pdf
    • https://cdn.shopify.com/s/files/1/0432/4920/5405/files/67373975657.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/miliberad.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_off00006cab.bin
640a901ec99f89fd0f47aa873a99f776e4e36983e7cd57c330ea55c1abd23d09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAB 5432 bytes
font_01_sfnt_off00007f2a.bin
e92fb08bb0a5ad4e39024d22203ed26ba38d0d03c332cb09f465bb93100f9d09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2A 10304 bytes

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