Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d76af7a739f3ac…

MALICIOUS

PDF

53.8 KB Created: 2020-11-05 05:27:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b2628c531c6688541c04b697330fb4c6 SHA-1: 57a353dce05cbf54886f00d89a545d01826ad5e2 SHA-256: c5d76af7a739f3ac294561d55c6bfc940a43e0cb02acffe78d8a703dc024fbd1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting academic content, likely a lure to disguise the malicious links. The presence of a link farm and a malicious redirector indicates an attempt to drive traffic to potentially harmful sites.

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.cc/123?keyword=ap+biology+dna+structure+worksheet In PDF document text
    • https://josadezabo.weebly.com/uploads/1/3/4/4/134490641/2302558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_5f8a26ca4d2e0.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/8709547.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_5f927fedd9e9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ee529b73-655e-4743-937d-ab8b5f60749c/lonolidad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/489bb934-62b9-4ae3-8f8c-dd895457da74/using_econometrics_a_practical_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/fomekibadifuvopebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/508d95f0-75cd-41a3-88ce-9205be83147f/rough_guide_portugal_not_to_miss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66b92e56-2e78-4b86-ba45-dcddc754edb1/lakowosupesaxawopevod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b889fcf-a000-4101-ada2-293acedcdd96/pokaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/511b80eb-6ca7-4896-b6d7-d317ee7fd6b6/glencoe_geometry_skills_practice_wor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6c81c5-92d7-4444-b82e-7fbe41cbe3fd/81026029417.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8330 5604 bytes
SHA-256: 40595d351a95d6d6e0ccb2aae79eb9c80cc978e6f67658ff773fac08cf854fae
font_01_sfnt_off0000963b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x963B 11288 bytes
SHA-256: b606efdb89eb1e390663f055769cfc09cc36775abaafdc80e1201d5802b176a9
font_02_sfnt_off0000bc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC13 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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