Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b5b595e16cd63c…

MALICIOUS

PDF

52.0 KB Created: 2020-08-23 02:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bb56c41dde377bf6696ef0454661701 SHA-1: 6d1f289d76b0970d6579aea84358ba8a05bef948 SHA-256: 38b5b595e16cd63c8515ddd9727ac86cb0848ebd3d7a7a0d3dbae4dc441ae338
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The document body, though heavily obfuscated, contains the same URL found in the critical heuristic, reinforcing the malicious intent. No scripts were extracted from this sample.

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.ru/pify?keyword=integrated+science+1+locating+earthquake+epicenters+answers
    • http://files.sghexin.com/uploads/1/3/1/4/131483147/e28141.pdf
    • http://files.nicolecudzilophotography.com/uploads/1/3/1/4/131438203/129525c4d4.pdf
    • http://files.calclugston.com/uploads/1/3/2/6/132683267/duxarejajanidoli.pdf
    • https://cdn.shopify.com/s/files/1/0434/5944/4889/files/47435511717.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/67863998076.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/laguwegasubamijofobemi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0600/9242/files/internal_auditor_independence_declaration_template.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/if_statements_in_excel_multiple_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1549/files/rufodasepesep.pdf
    • https://cdn.shopify.com/s/files/1/0435/1374/1471/files/uniform_convergence_of_holomorphic_functions.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2545/files/google_ntp_server_ip.pdf
    • https://cdn.shopify.com/s/files/1/0428/1358/7622/files/appositives_worksheets_5th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/basic_income_tax_course_volume_1.pdf
    • https://cdn.shopify.com/s/files/1/0435/5653/6479/files/nowov.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_off00008bfd.bin
7bcad9c8acded3fda96a31c935d119c8f849ad344824b9d067c5a83bc56518f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFD 5604 bytes
font_01_sfnt_off00009f14.bin
ea7f9552cdc2e3f25f286d48f035bc8fe141ec37057bfbdb9d0af93b720db6f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F14 10368 bytes