Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5fb4005f83018c…

MALICIOUS

PDF

45.8 KB Created: 2020-11-01 08:38:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b6ef0720e90246bf024db9d1ee94f948 SHA-1: 6aa4a5e5e21b85e44b182a71bd7cb22905bfdc57 SHA-256: bc5fb4005f83018c04273a340982da420cb3b8fd174b68ad8690b741f2dcb5db
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://cctraff.ru/aws?keyword=i+survived+books+pdf', which is also flagged as malicious. This suggests the document is designed to lead users to malicious sites, likely for phishing or malware distribution.

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://cctraff.ru/aws?keyword=i+survived+books+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5f8da77e4dd7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f8b7e8632206.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/a27db3cf-5f14-4dc2-b458-52a2da77413e/xuzakevozivofopefotibafu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4874/5152/files/76875168349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4013b0f6-bc1f-4541-81c4-8060cd5cfcbe/83042135530.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9928/2336/files/43436771519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0716d390-2162-46c8-9708-c7684a205b74/8069635625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd34a57-805d-49dc-87bc-c7ad87965f69/95184874131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f308cfbd-f631-4330-8506-b4f2511e8c05/bedanojabowavopufipoja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1421/6616/files/mccarthyism_and_the_crucible_worksheet.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B1 4996 bytes
SHA-256: f822af87185323371829a72ab4a2c64c30b673d8f9ef58ea364b553e72d078b9
font_01_sfnt_off000077c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77C2 10536 bytes
SHA-256: 6d9321783f99c76179e1891e7a883f881b33c96b215ea4e1cbbe5e68b12968f6
font_02_sfnt_off00009bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BCB 6084 bytes
SHA-256: f5fe2de525700542684e23a11f1cb185b9ffab030677c6a48f3d5a1088c9e53b

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