Malicious PDF — malware analysis report

Static analysis result for SHA-256 737cd855a87444d9…

MALICIOUS

PDF

49.5 KB Created: 2020-10-08 11:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: afca675918b73e0578e0d556c1f59032 SHA-1: d5be1c44adb1c8b7dfa1ae33c289aa3032a85d6c SHA-256: 737cd855a87444d95ad03956bc0f7046fb754da6a540c09fa1290a897c0586d9
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL, https://cctraff.ru/strik?keyword=mi-pse-s2-iv+installation+manual, is the primary indicator of malicious intent. Although no scripts were extracted, the PDF structure and the malicious URL suggest a phishing or redirection attempt, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://cctraff.ru/strik?keyword=mi-pse-s2-iv+installation+manual In PDF document text
    • http://files.tricklecreekbooks.com/uploads/1/3/0/7/130775567/rigesax.pdfIn PDF document text
    • http://files.techniquejobs.com/uploads/1/3/1/4/131482975/toxemoxuwera.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eda8d1ac-08c4-4594-97cf-876f72dcf944/51759923394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bd59c94-2541-4c13-9c4d-6e88181eb50c/72419191571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98938a8e-6e72-4799-8348-15c8e6c1e6ce/dowejozukejarexawilupap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e38ed1-686a-4961-94b6-e55f0e7eebbb/konametutosadiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c7d9178-2148-4b9a-8801-c64c70a61c66/lujozupozifipometomabav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9525/2374/files/kikofebekisawilafen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7658/2560/files/linarekez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2707/8052/files/george_soule_get_involved.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/7603/4198/files/agile_software_development_with_scrum_ken_schwaber_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/7426/5503/files/allison_250_maintenance_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0044/6626/files/grace_hopper_conference_resume_database_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7668/0870/files/paradise_lost_in_plain_english.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E1 5100 bytes
SHA-256: c443199682716dad8cb45b14efa473c1de5e9af7419fe97498abf3a3b26eeb76
font_01_sfnt_off00009543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9543 10644 bytes
SHA-256: fdeed3940ae73f4fe0a3d4364e6189d7011a72afcb2d39866e10ec71ab5f9c41

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