Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5377b0134f8c19…

MALICIOUS

PDF

40.1 KB Created: 2020-10-31 06:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 60105d4835c66c350d9c2e69d4f3c942 SHA-1: 7957edf14e7faa5c96d2388cb7e49829ed110f33 SHA-256: 2a5377b0134f8c19edf18baeeb842e731bf783ccf75c5f0350950277cb2d4ef0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains the URL 'https://ggtraff.ru/aws?keyword=airsoft+mosin+nagant+shell+ejecting', which is flagged as a known malicious redirector. The presence of numerous other PDF links suggests an attempt to obscure the malicious destination and potentially engage in SEO manipulation for malicious purposes.

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://ggtraff.ru/aws?keyword=airsoft+mosin+nagant+shell+ejecting In PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/685507.pdfIn PDF document text
    • https://sizojupitad.weebly.com/uploads/1/3/4/3/134332657/pokoxanemibaxo_kodikudovila.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/3cd5d338-a0b3-4d9e-8589-0b5dea2acdd6/best_way_to_make_gil_ffxiv.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/scott_m_brame_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/187cf307-0746-4090-8f0f-18619dceab61/sugar_mill_country_club_homeowners_association.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/analog_electronics_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a37f22b9-d17b-4950-989a-d5c3e7aa0264/58359938438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6087787-08ad-4dbb-970d-ce23dc63d661/fixasusidukak.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/6715933428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f323f7d-acf5-4259-aa5d-c7f0e62cbd8e/fupiwonizipuxumajodikej.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/polozupadovubovidusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf6c112-0bb5-4aef-91e3-b5c4c90b0939/34828737859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ca5589-ee1f-4d2d-bbbe-60bd4871d7e6/59947126222.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_off0000597e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x597E 5360 bytes
SHA-256: 71c90a64d1a101e0898fa2dde1a9f3ed578fd5e6d2804fb44c98b62c5a132bd0
font_01_sfnt_off00006b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B94 12580 bytes
SHA-256: d99de142cf346c02a4d5b41c4c8b3c4c90761f48e1b11ae46e185ff906fff52e

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