Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87018325b79ced9…

MALICIOUS

PDF

47.2 KB Created: 2020-10-02 02:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a05a104cebeb8bafafcdbf664ae7ebcc SHA-1: 5f27f70891cddcd54892476a4cc6d3167c89236d SHA-256: d87018325b79ced9ac544370e639d5648547dd27a933fb8ebb8f6f128a2ea34c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed for SEO manipulation and traffic redirection. The primary URL, 'https://cctraff.ru/strik?keyword=3ds+max+building+modelling+tutorials+pdf', is flagged as a malicious redirector. This suggests the document's purpose is to drive traffic to malicious sites, likely for further exploitation or phishing.

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/strik?keyword=3ds+max+building+modelling+tutorials+pdf In PDF document text
    • http://files.eileenmshinners.com/uploads/1/3/0/7/130776757/f9592.pdfIn PDF document text
    • http://zepenanaw.marthashanahan.com/uploads/1/3/0/8/130813528/21160c.pdfIn PDF document text
    • http://gekoxajog.pulleyautoparts.com/uploads/1/3/0/7/130740437/mijekuxore-jubibav-pimefiwajixaga-dobaralo.pdfIn PDF document text
    • http://vuzigarez.rotaryaviation.com/uploads/1/3/1/3/131379732/4595362.pdfIn PDF document text
    • http://files.srmta.com/uploads/1/3/1/3/131383657/c0d337a7.pdfIn PDF document text
    • http://giwesuj.jenniferseasonsbooks.com/uploads/1/3/1/1/131164504/rivugovu.pdfIn PDF document text
    • http://luporax.fromsistertosister.com/uploads/1/3/0/7/130739640/4578481.pdfIn PDF document text
    • http://files.tvlsolutions.com/uploads/1/3/2/6/132682723/kumetedusi_dudusixozit_gewikibozaju.pdfIn PDF document text
    • http://vesufelej.drlindahoffman.com/uploads/1/3/2/7/132741508/wakizasepasiwipalo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f7314eb5-d99c-49e7-a389-064aaeae126d/45000230462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08dc2a0c-9f4f-4ab8-a7b4-da67c3c0b421/nofatedem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/668ac4b0-ab11-4469-b9f1-30e89cce1ead/melibefufubaxikelifufake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00e1b656-0ff2-4755-8cc4-f9d4d7bc5f35/faraliruf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4050184e-50fc-483f-88dd-fb7bb22f2577/relotomafelof.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C65 5520 bytes
SHA-256: baffb65e0b101b6c03405ab569cc2206874cb40a0bf0dfa27802ef6fb9e3689c
font_01_sfnt_off00007f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F04 10144 bytes
SHA-256: 5a08e5c2d8232bcff2e1b19fd8a911dde90fcdc4bad8ca8ac7c1431b47c4d073
font_02_sfnt_off0000a1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1B0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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