Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f81a89fd2db153c…

MALICIOUS

PDF

45.7 KB Created: 2020-08-24 06:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2c4c44940833d56156de6d290bba7ce SHA-1: 0c98aaee0c0748621e9e6de353738cf10f8e888d SHA-256: 5f81a89fd2db153c88e1d8356b3e40b93694025ccf0dda16c2a8afbaf2907cf7
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure for a 'Google Chrome browser update' which redirects to malicious infrastructure. It also features a large number of links, many pointing to PDF files, suggesting a link farm or SEO abuse. The presence of a browser update lure and redirection to a known malicious URL strongly indicates an attempt to trick the user into downloading or executing a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.cc/pify?keyword=google+chrome+browser+update
    • http://wirewukax.taylordumasdesign.com/uploads/1/3/2/8/132814476/7652784.pdf
    • http://files.athenstherapyco-op.com/uploads/1/3/1/4/131453124/5286966.pdf
    • http://fobifaw.awstartingfromscratch.com/uploads/1/3/1/4/131407148/mazemaner-risefusapuviz-vilas-gifexutunezejip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9865/1289/files/live_college_football_app_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gerakofidasetivivirodipel.pdf
    • https://cdn.shopify.com/s/files/1/0431/7085/7122/files/reliable_time_server.pdf
    • https://cdn.shopify.com/s/files/1/0436/9465/3594/files/eldritch_name_generator.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96056065099.pdf
    • https://cdn.shopify.com/s/files/1/0430/6557/3537/files/60959401140.pdf
    • https://cdn.shopify.com/s/files/1/0434/7753/2822/files/54164733476.pdf
    • https://cdn.shopify.com/s/files/1/0432/5628/3296/files/82194634679.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/19670587241.pdf
    • https://cdn.shopify.com/s/files/1/0436/0772/0094/files/bank_exam_english_study_material.pdf
    • https://cdn.shopify.com/s/files/1/0431/1855/9393/files/indemnification_form_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/89210030356.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_off0000711c.bin
63627f8ec4c9f58041348745909555bfaf3f89aade3aa6e77f90c184fcded547		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711C 5752 bytes
font_01_sfnt_off00008499.bin
1bcc85f9e44b9e3a647e8e91b97de50dbebacd71cc9d496ffcbb42b8815f64d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8499 11088 bytes

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