Malicious PDF — malware analysis report

Static analysis result for SHA-256 865927a3f5822d81…

MALICIOUS

PDF

73.9 KB Created: 2020-10-30 15:11:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5fe9cb6049881975c84afdfecd97132e SHA-1: 7c38098c80bac6c083cb82bf5f8507693b57b27d SHA-256: 865927a3f5822d8158a96d8e776b7b9e683506689f28bd0bd50cabbd890416ac
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains the URL https://ttraff.com/123?keyword=chemistry+lab+report, which is flagged as malicious. The presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect the user to a compromised site.

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/123?keyword=chemistry+lab+report In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390660/normal_5f8e81e88f91f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389571/normal_5f989953a3031.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/88fd0d4a-fef4-439b-b51d-db61e23aca59/3333349866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1a0c91-71a4-464a-99f5-185c7b1eabf1/eid_2015_in_saudi_arabia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/926d3a88-324b-49e2-882c-b49b7cb30203/ratej.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/sogozawepulos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a213ff1f-b968-4f64-8638-1fd63a500183/30929997477.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1058/7296/files/66590278385.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/13181334538.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/53682261717.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/29221357426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a865e1-5d37-4c28-a699-1c997f14facb/60946101808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76e85c0d-93e0-41b9-a5f9-a1facbfa2183/rx_560_crossfire.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/30366235523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1533506a-b7ce-4534-b4e0-c83b3c0e7bf5/566450269.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/0688/1702/files/earth_science_regents_study_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3C 5208 bytes
SHA-256: 6b0f2452e68f814d8d6a2b5e418f4dc465f42ecc6cf8a877d295aa0d02146f7b
font_01_sfnt_off0000dbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBD 12196 bytes
SHA-256: af56a40c348df0bbd57229098ca296aea2a8ed6bbe716ab513dd4c302fb9d934
font_02_sfnt_off00010518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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