Malicious PDF — malware analysis report

Static analysis result for SHA-256 887b5ffb2d379a80…

MALICIOUS

PDF

47.5 KB Created: 2020-08-14 22:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7b531287f74c7f6100eb98771057a5e SHA-1: b9c319d3d40c1dd8e269d68dddc88da2e9011c09 SHA-256: 887b5ffb2d379a80736fce42208b92dba9c69409fcd3ddb9c827c99b655c2d86
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link disguised as a 'house construction agreement format in tamil' which redirects to a known malicious domain (ttraff.com). The PDF also hosts a large number of external links, many of which point to Shopify domains, suggesting a link farm or SEO manipulation tactic to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=house+construction+agreement+format+in+tamil
    • http://files.aquaterrespa.com/uploads/1/3/1/3/131397946/c683b5f76ebfa.pdf
    • http://files.cisenoughisenough.org/uploads/1/3/2/6/132681884/koxumamafedazi.pdf
    • http://files.larte.us/uploads/1/3/1/3/131380288/c33f435fd73d27.pdf
    • http://nugazo.myconcordpharmacy.com/uploads/1/3/1/4/131453133/xaniw.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/35631612778.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/detailed_lesson_plan_in_filipino_grade_8.pdf
    • https://cdn.shopify.com/s/files/1/0433/9377/7827/files/california_dmv_real_id_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/0854/0324/files/ate_ve_su_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/1352/8987/files/phonics_worksheets_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0432/4877/9426/files/dusogudavekokofixipubu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6671/0433/files/kufawebe.pdf
    • https://cdn.shopify.com/s/files/1/0433/3626/9983/files/nunizilotinot.pdf
    • https://cdn.shopify.com/s/files/1/0432/5585/7315/files/85562301625.pdf
    • https://cdn.shopify.com/s/files/1/0433/7405/1491/files/the_prince.pdf
    • https://cdn.shopify.com/s/files/1/0438/5597/0454/files/wudikekosepogimejipa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00007038.bin
1341f703209d828e2635ce2a39932f8ebb0711cc9b5ee52608b21ab0487f993d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7038 13088 bytes
font_00_sfnt_off00005ec8.bin
719bb78aa2e71a543fc39d963cb75123bd0f18a237e7aafe840981324a3444df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC8 5164 bytes
font_02_sfnt_off00008f9e.bin
0b12baf5fc139f15f05ddbbfa36156a8aa57ac0269a7627a342cb438f585cd6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9E 9776 bytes

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