Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9db85410a5e5196…

MALICIOUS

PDF

39.4 KB Created: 2020-08-08 17:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf80e85c236954734afb22bbe6165d7c SHA-1: 60ed529aa8e21edcce023641f3bbfb2482f5ff5b SHA-256: c9db85410a5e51969007bc37a3530983e4b0bb4c2179f991ebc4c33f966f9e44
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=s.+y.+b.+com+books+pdf+mumbai+university'. This indicates the document's primary purpose is to trick users into visiting this malicious URL. The presence of numerous other external PDF links, identified as a 'PDF link farm', further supports the malicious intent of distributing or redirecting users. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=s.+y.+b.+com+books+pdf+mumbai+university
    • http://fariji.heathmereprimary.org/uploads/1/3/1/3/131379965/7f20f41271e33.pdf
    • http://files.huntingtonlandmark.com/uploads/1/3/0/7/130738752/velaxenozoxunedutud.pdf
    • http://files.wildgooseqigongpdx.com/uploads/1/3/2/7/132740951/6080873.pdf
    • https://cdn.shopify.com/s/files/1/0428/0107/0247/files/13935022539.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/abecedario_completo_mayusculas_y_minusculas.pdf
    • https://cdn.shopify.com/s/files/1/0447/0842/9977/files/accountancy_comprehensive_project_for_class_12_cbse.pdf
    • https://cdn.shopify.com/s/files/1/0436/0821/1619/files/nuwim.pdf
    • https://cdn.shopify.com/s/files/1/0440/1653/3654/files/tutorial_of_microsoft_excel.pdf
    • https://cdn.shopify.com/s/files/1/0438/4020/9056/files/41595501275.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/lafikuf.pdf
    • https://cdn.shopify.com/s/files/1/0436/2380/9187/files/24969093311.pdf
    • https://cdn.shopify.com/s/files/1/0430/2870/9539/files/75938969196.pdf
    • https://cdn.shopify.com/s/files/1/0429/0668/1497/files/quality_control_interview_questions_and_answers_in_pharma.pdf
    • https://cdn.shopify.com/s/files/1/0432/4143/9400/files/dafejagitilomepu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2672/files/zedubipo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/29064623740.pdf
    • https://cdn.shopify.com/s/files/1/0439/3834/9211/files/restaurant_training_manual.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a96.bin
39567c6fdf6d091aab8c52190a013fb0321a5cc2aa57e21850b892bc2e2a4be2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A96 5768 bytes
font_01_sfnt_off00006e3d.bin
880dae9b44a5d9193136eeba096ca3c4b9504051380edf06890fba3018964c9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3D 10012 bytes