Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a61791428a57a78…

MALICIOUS

PDF

98.8 KB Created: 2020-11-08 07:45:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 426ce85e0d75e9095da6207a16823464 SHA-1: 8ed38661853baac0c3cbb23d085db997f4ba5c3d SHA-256: 0a61791428a57a78fa238df959b790a9f443989f24784318d2ea46f4d32c2d78
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, characteristic of a link farm. One of the URLs, 'https://cctraff.ru/aws?keyword=trace+a+drop+of+blood+worksheet', is identified as malicious redirector infrastructure. The document's structure and the presence of numerous external links suggest an attempt to lure users to potentially harmful sites, likely as part of a phishing or malware distribution scheme.

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://cctraff.ru/aws?keyword=trace+a+drop+of+blood+worksheet In PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/52022d551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425913/normal_5f9f88139ef1a.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/5049c9fe-f036-456d-b0b0-5c54e88536f5/mopazerod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfae8224-36f9-49de-bd3d-aee24a8b3f49/word_count_on_pages_macbook_pro.pdfIn PDF document text
    • https://tezebotum.files.wordpress.com/2020/11/bryan_adams_all_albmleri_cretsiz_i.pdfIn PDF document text
    • https://marobogogo.files.wordpress.com/2020/11/adobe_acrobat_pro_serial_number_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7663656-322e-4798-9de6-2e1dac4ab492/cember_health_physics.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/68091325827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f20bad-0b8e-454c-a9da-be2c47334e4c/sewudoniwixipadiv.pdfIn PDF document text
    • https://xojomome.files.wordpress.com/2020/11/miwajemuruloxuzerokimo.pdfIn PDF document text
    • https://jowovesopa.files.wordpress.com/2020/11/rikajanolerimiverut.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_off000146f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F0 5488 bytes
SHA-256: 35e8e19b01244a34d86212905e1029622811d4830ab6e47e68fa6b0eeab07977
font_01_sfnt_off0001599b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1599B 10560 bytes
SHA-256: 9c0e6c94ade90452e2f782df9b528e824dd94da733abe2a035ce4610831bed17

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