Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcadc6d88e6c7ca0…

MALICIOUS

PDF

38.5 KB Created: 2020-10-04 13:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7246f807dd0f4fb533ab46af71eed32a SHA-1: 75661fed03763cebd30c95e3d6700f8a46a15b85 SHA-256: dcadc6d88e6c7ca0731745dec75125db3f504614a87a2fc6afa10c7a6a6bd576
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating a redirector to known malicious infrastructure. The document body, though obfuscated, contains a URL that aligns with the malicious redirector. The presence of multiple links on disposable hosting further suggests a link farm designed to direct users to malicious sites.

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 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://ggtraff.ru/pify?keyword=dictionary+text+file In PDF document text
    • http://files.communicartspeechpathology.com/uploads/1/3/1/4/131437702/rirexamovikumus.pdfIn PDF document text
    • http://files.michaelbrewsterart.com/uploads/1/3/0/8/130814110/zurotixefejador-kizaxo.pdfIn PDF document text
    • http://tepori.titusmountain.com/uploads/1/3/0/8/130814328/maragomitepibe.pdfIn PDF document text
    • http://files.cummingchurchofchrist.org/uploads/1/3/1/4/131452922/5715603.pdfIn PDF document text
    • http://files.countryroadsrvpark.ca/uploads/1/3/1/0/131070712/juluxomim.pdfIn PDF document text
    • http://jasamonuf.aoneconstruct.com/uploads/1/3/0/7/130740522/lokilu.pdfIn PDF document text
    • http://files.northernbugwear.ca/uploads/1/3/1/4/131407165/modofuda-tevuravikat-xejaduve-xewuzedalupus.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/1/0486/7991/1574/files/vibagabovimenipoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4530/1671/files/how_many_chapters_in_death_stranding_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a93aa8-c3b6-414e-8db8-199c1ee1f181/97322174920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852e0e0e-738e-4051-924b-6b37d332b700/botezovepujagarasomexuras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a005b0-e273-4e59-9ee6-37ddce7fda66/sivebuletodapupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a862ccd8-ddf7-4b88-adf3-9263d8e5d630/bilaxalemoxema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f2cd7f-5d01-426a-8353-9cbfe0be9896/gebirokenapafubiga.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_off00005c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C2F 4864 bytes
SHA-256: 317b9bd92060f574a492903ab1ee9b844004e5c2245d95974c9a57efa182c62e
font_01_sfnt_off00006ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE3 9512 bytes
SHA-256: 49fd8a6f9fa92e69f670f125c9cee0f09035444aca35b0f0d2f6dc04d3482c19

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