Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc6549647f401e9…

MALICIOUS

PDF

45.2 KB Created: 2020-10-27 02:59:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8275a99e01340dfc1712ac9e7d012c3f SHA-1: 3d6f240dcbaabc9bf9d56961438b7187ded9a6b4 SHA-256: 2bc6549647f401e97cf8a3eb4ce638acc8f97c4f19bc0ade244e95086c741405
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, functioning as a link farm. One of these links, https://gettraff.ru/strik?keyword=cobra+29+ltd, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be to lure users to malicious infrastructure through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?keyword=cobra+29+ltd In PDF document text
    • https://pimetagedipimop.weebly.com/uploads/1/3/1/6/131636886/4d755064aa91582.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/tajemibirumemiv.pdfIn PDF document text
    • https://sejejuno.weebly.com/uploads/1/3/4/4/134447194/widilusow-mogitaser.pdfIn PDF document text
    • https://jawokipuroz.weebly.com/uploads/1/3/4/2/134265350/4815535.pdfIn PDF document text
    • https://xozoravupot.weebly.com/uploads/1/3/4/3/134314106/f3a95a1e7ef56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5f8b596b25661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5f912142a293d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5f95eb73ef007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382186/normal_5f8e7db57ddea.pdfIn PDF document text
    • https://veborikaja.weebly.com/uploads/1/3/4/3/134317734/1923321.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/wizuxizeke_jexuzufevox_zexemagatupa_lupusofejox.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/1/0502/1673/0799/files/sky_sports_guide_boxing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/0851/4974/files/soup_recipes_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5322/6433/files/gcf_and_lcm_worksheets_grade_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c65a3d1b-3468-45f2-929e-655faec96f4b/installation_electrique_domestique_p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95682d6-3c29-42fb-ab3f-9bc3ff2eb1bb/30360928734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac5387a8-39d9-498c-9287-645ca480fdd7/gurajimorolugifamis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cfd5521-3255-4cc2-bdc7-b316ce9304fa/zaremu.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_off00006e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E33 4976 bytes
SHA-256: 7a385d6eea43d5205d5fa19eda409ab49d023bb717c588a1bc42b0a659c8a22b
font_01_sfnt_off00007f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F21 11768 bytes
SHA-256: 03f594a25c8d8288894b59bbb50ee3111ee0b34cf5b102a769d4a223ff03d4ee

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