Malicious PDF — malware analysis report

Static analysis result for SHA-256 037cd3acb040ffdf…

MALICIOUS

PDF

50.4 KB Created: 2020-08-06 21:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c3004206ccb1cb71d315c6221ff22445 SHA-1: 6c40bad76efa0404c2fd66ae97d7c80023b52d65 SHA-256: 037cd3acb040ffdf65def6e0eb7a7a3158dc16e5343837ff55449b3ddf830abc
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many pointing to what appears to be a link farm designed to improve search engine rankings. One prominent link, https://ttraff.com/pify?keyword=biblioteca+virtual+gratis+pdf+espa%25C3%25B1ol, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious infrastructure.

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/pify?keyword=biblioteca+virtual+gratis+pdf+espa%25C3%25B1ol In PDF document text
    • http://files.interactive-maths.com/uploads/1/3/1/3/131397964/nojanulujowumujesi.pdfIn PDF document text
    • http://files.toledohvacpros.net/uploads/1/3/1/6/131607565/vesaxize-wuvujizipuba-xozez-jobap.pdfIn PDF document text
    • http://donowipe.amongmountains.com/uploads/1/3/0/9/130969352/7082156.pdfIn PDF document text
    • http://files.achschoral.com/uploads/1/3/0/8/130814043/b78535dab7f454.pdfIn PDF document text
    • http://files.goodtimesatlanta.com/uploads/1/3/1/4/131453348/fijajubez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wadilizesiwegokadokepub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3460/5730/files/machinist_handbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4161/2199/files/6000499614.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2171/4079/files/rakidiretefadokuwaviro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3240/4380/files/pebevuvavor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22650439267.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5801/1035/files/90116706185.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/pepuboxoriwosetubilaro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7285/5957/files/oath_of_crown_5e.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_off0000834f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x834F 5784 bytes
SHA-256: ed20d344882ef7ae6de114995ca869fda04649d634a1659c07c27a34394e7f89
font_01_sfnt_off000096d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96D9 10388 bytes
SHA-256: f03fafc6d806f64d7add85e90e9dddccad645d9fae919faabd6364dfd04e2fc6

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