Malicious PDF — malware analysis report

Static analysis result for SHA-256 68efdd91b4b0a14f…

MALICIOUS

PDF

49.2 KB Created: 2020-08-08 23:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82debf3ffc2b8caa12757161d98ce900 SHA-1: e086b9cfcd71a405f03b11d101745f3856f657be SHA-256: 68efdd91b4b0a14f91c7eed5b2f13007a1ec6a5bd557233a3b5ae077d214da0e
154 Risk Score

Malware Insights

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

This PDF document contains a link farm designed to appear as search results for "oc caste list in tamilnadu pdf". The primary link directs to a malicious redirector infrastructure, indicating an attempt to lead the user to harmful content. The presence of numerous other PDF links suggests a SEO poisoning or link farm tactic to obscure the malicious intent. No scripts were extracted, but the document's structure and embedded links are indicative of a phishing or redirection attack.

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.com/pify?keyword=oc+caste+list+in+tamilnadu+pdf
    • http://files.ellisandassoc.com/uploads/1/3/0/7/130775393/b5b7cae63c0.pdf
    • http://files.trimbleassociates.net/uploads/1/3/1/3/131379540/muludifakemeveri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/wiwajifaginivelexasu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8271/9136/files/sivokatulagojebogod.pdf
    • https://cdn.shopify.com/s/files/1/0431/9887/3762/files/59713375466.pdf
    • http://files.lane.people.ua.edu/uploads/1/3/1/3/131379213/aecb15.pdf
    • https://cdn.shopify.com/s/files/1/0432/6716/2276/files/bajosamonumuvekuto.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/zivuzarukarekolebekinip.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/asme_b31._8.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/antel_speed_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/1081/8201/files/libro_sobre_arquitectura_de_computadoras.pdf
    • https://cdn.shopify.com/s/files/1/0437/5432/4117/files/bodojazovuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7056/files/lexuginipubekeb.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/74416547116.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/kavesasuleteripokoli.pdf
    • https://cdn.shopify.com/s/files/1/0434/4378/1792/files/pancreas_anatomia_e_fisiologia.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_off00007deb.bin
56d59ce1606b20181d823724293e4cb30ea5890c7c49477610f8df0f5954f171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEB 5232 bytes
font_01_sfnt_off00008fac.bin
1a62b2308b192a85f141c03329b278e357f72fed8d66b03511c812aaa245b22f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FAC 12860 bytes

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