Malicious PDF — malware analysis report

Static analysis result for SHA-256 641f979521064058…

MALICIOUS

PDF

49.6 KB Created: 2020-11-02 03:27:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e180c91b5cb5e69c2d949a69b24ffec8 SHA-1: dd27dca2c64bfecbefa72623f7a37b4bf90d9e4b SHA-256: 641f979521064058cca3fc339bcdd9c0791dd1d7e2e02415f799ea9f5e1fa6a0
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.ru/123?keyword=swfa+3-15+scope In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/1515306.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/bc879363a1.pdfIn PDF document text
    • https://latijazaw.weebly.com/uploads/1/3/4/3/134312978/7673166.pdfIn PDF document text
    • https://kakoxisowi.weebly.com/uploads/1/3/4/3/134358665/1520416.pdfIn PDF document text
    • https://fujimerikav.weebly.com/uploads/1/3/4/3/134307110/8797711.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/e991526d-9411-4083-a809-8e4c5f610648/mcdougal_littell_algebra_2_and_trigonometry.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/rozuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/220d02e4-90f6-42ac-886e-19d3661b3d3d/us_master_tax_guide_wolters_kluwer.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/jepuvinavasavuxore.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/interview_questions_on_java_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/510c241e-a9b0-4254-8322-3cc69171e1a4/11843988279.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/cosmic_energy_anne_jirsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec57947-9007-44db-80e3-8921db94dbca/vastu_shastra.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/77130338279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d7a7178-73c1-479e-9582-caf6671edc00/57710649576.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/mann_buddenbrooks.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/arihant_banking_awareness_download.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_off00006d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D05 5448 bytes
SHA-256: 04c4be0bd33faa056f2c4c9ac7552a382dd9001351e8a31acedcc09c0385e99b
font_01_sfnt_off00007fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FCD 10612 bytes
SHA-256: ceb229a4279e918a30b894d82f55d7e01e9eb2eefdc6bd494e0a3a586010e1c0
font_02_sfnt_off0000a438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA438 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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