Malicious PDF — malware analysis report

Static analysis result for SHA-256 725d7cac2c1b1b6e…

MALICIOUS

PDF

41.9 KB Created: 2020-08-15 00:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da2d8bae50f6695f882c106ba2274c6c SHA-1: 8073937d6c0b608c1fbe8ad050118f628eb70183 SHA-256: 725d7cac2c1b1b6e112a547ef44bc3b9f03bed9e7dcc3b2e0edf027cbed5da42
194 Risk Score

Malware Insights

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

This PDF file contains numerous links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.com/pify?keyword=malwarebytes+anti-+malware++cnet, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to 'Malwarebytes anti- malware cnet', indicating a lure to trick users into clicking the malicious links.

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.com/pify?keyword=malwarebytes+anti-+malware++cnet
    • http://files.frizzante.ca/uploads/1/3/1/4/131453395/mivatefovu-mutesasunine.pdf
    • http://files.lonestarwildernessmedicaltraining.com/uploads/1/3/0/9/130969818/a0a0f434dbd74.pdf
    • http://gabake.designamanila.com/uploads/1/3/0/9/130969130/41c961d00ea21d7.pdf
    • http://files.bellamcbride.ca/uploads/1/3/0/7/130776152/lamapusiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/beloromawodosuxaso.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/mpdf_page_break_inside_avoid_not_working.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32773531818.pdf
    • https://cdn.shopify.com/s/files/1/0431/5113/0785/files/markov_chain_java.pdf
    • https://cdn.shopify.com/s/files/1/0431/4333/2000/files/centrifuge_principle_and_application_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0438/2756/0610/files/suzuki_motorcycle_repair_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/pezid.pdf
    • https://cdn.shopify.com/s/files/1/0434/3663/8369/files/48888722425.pdf
    • https://cdn.shopify.com/s/files/1/0433/9377/7827/files/49163251829.pdf
    • https://cdn.shopify.com/s/files/1/0435/4958/9668/files/suzuvuvevekupeguwasavav.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_off00006769.bin
cf14514e135a2858d6e5f32f3517924afd8016a8050de297904a22ac2ecaefe4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6769 5316 bytes
font_01_sfnt_off0000797f.bin
fbb9d24db0175b778ac8a112adfc1dde870440b2f604dc4518ea995ceb1ee61d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x797F 9824 bytes

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