Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5d8c2b47cbe6f2…

MALICIOUS

PDF

44.9 KB Created: 2020-08-11 08:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36edf8e2e058d75ca8e1f8ad8d6c70cd SHA-1: 2b9cb46e3bda52da3c9fe1b13dd00b08fe597fc7 SHA-256: 0b5d8c2b47cbe6f27c3b31311b032bdf4c29dea96eb5567be19edbdb756ff4e8
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a free download for a technical handbook. It also hosts a large number of links to other PDFs, likely for SEO manipulation to improve search engine ranking for malicious download sites. The ML classifier 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.com/pify?keyword=ashrae+handbook+fundamentals+pdf+free+download
    • http://felunati.mygentlebeginnings.com/uploads/1/3/1/0/131069839/3485143.pdf
    • http://tasivalud.twostallionsthailand.com/uploads/1/3/0/9/130969959/e7538.pdf
    • http://files.cdgpc.com/uploads/1/3/1/3/131379054/mikotixebisole.pdf
    • http://files.asha-ny.org/uploads/1/3/2/7/132740778/0e888ca5c7a95d8.pdf
    • http://tokoxu.daughterofthestarswellness.com/uploads/1/3/1/6/131607062/3d3755.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5848/7715/files/nunizuwanobobubosuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/5525/1605/files/machinery_s_handbook_29th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/lijetaviwibep.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2758/files/6177860838.pdf
    • https://cdn.shopify.com/s/files/1/0447/9621/5456/files/66831283240.pdf
    • https://cdn.shopify.com/s/files/1/0437/0484/4442/files/ruserebelofuwiregi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32732230761.pdf
    • https://cdn.shopify.com/s/files/1/0438/3437/6352/files/miller_symmetry_groups_and_their_applications.pdf
    • https://cdn.shopify.com/s/files/1/0436/3629/3785/files/data_mining_algorithms_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1443/files/rasekovamiwela.pdf
    • https://cdn.shopify.com/s/files/1/0434/5764/2648/files/deconstruction_theory_and_practice_christopher_norris.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1734/files/winzip_21._5_activation_code_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/6425/4883/files/bncc_lngua_inglesa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/kumobiripamomikalurekulez.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_off0000719a.bin
302bc388f7eebf11a811ba586f8e260452ed72f2ad254a1b874bc8788b0a80f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x719A 5568 bytes
font_01_sfnt_off0000845e.bin
dcd936a7f1fb9e6f6b124048b6e9d5dbac3d839e281a87862a3e9aa9196b0a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x845E 9788 bytes

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