Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5bcd31ff278d09d…

MALICIOUS

PDF

79.8 KB Created: 2020-11-24 10:58:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f45d1ec97c34feee24a6a58c455fbc9a SHA-1: fe0f69f44ae54f244bd465da1015b5f906295d76 SHA-256: b5bcd31ff278d09d727161f54f32768659b0c5b91a7c9b234e5d711eb1ae0fbd
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One link points to known malicious redirector infrastructure, and another heuristic identified a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The document body is heavily obfuscated, but the presence of these links indicates an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=tv+guide+st+joseph+mo+suddenlink In PDF document text
    • https://zoroxazug.weebly.com/uploads/1/3/4/6/134614170/a26d71a4f21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489722/normal_5fadbe4bb2305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_5fb93a2b565f5.pdfIn PDF document text
    • https://wivirupi.weebly.com/uploads/1/3/4/6/134666213/pepifesipu-zufonit-wilogokenuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454807/normal_5fb6a3a4684fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/duncan_phyfe_dining_table_painted.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/opposite_words_in_english_with_hindi_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0ec060b-28b0-4926-8605-2efa54b5b8f9/zesotinevodejizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9acbeb01-bd56-42f9-bc49-3db206472141/gadomudenugolubam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53d85edc-f092-497e-8a62-c4161adcb67c/suzuki_grand_vitara_2014_owner_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/jezefewezosazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e831af-8f83-4829-b8eb-036a3a7f9afc/81793003821.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_off0000f69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 5216 bytes
SHA-256: ccf52e15675d2410815c54bda1cb12448d3d8d803ac4aad81287be8e81291a43
font_01_sfnt_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 13020 bytes
SHA-256: da2a6aeb12d78bc5f5bb3375437b0aeae35a136a69616c84af437f8b3fddfb98

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