Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f01a76127067aa3…

MALICIOUS

PDF

36.4 KB Created: 2020-10-03 17:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 50193ab251f268733ad05999a21280ba SHA-1: d6e79485b131a75086aac672d80a1fd8efb984e9 SHA-256: 9f01a76127067aa3bd18be67546e7cd412878ee40b5fad84435c54a9912e9acd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable hosting, characteristic of a link farm. One of these links, https://cctraff.ru/strik?keyword=approaches+to+psychology+glassman+pdf, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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=approaches+to+psychology+glassman+pdf In PDF document text
    • http://lomukunas.gnbcmountainvalley.com/uploads/1/3/1/3/131398379/7229229.pdfIn PDF document text
    • http://files.richardellishair.co.uk/uploads/1/3/1/4/131452841/wobipogofiz.pdfIn PDF document text
    • http://files.robertmeyerlaw.com/uploads/1/3/2/6/132681053/gizibuzud.pdfIn PDF document text
    • http://vukadas.camptowandastore.com/uploads/1/3/0/7/130776279/jibowaritexo.pdfIn PDF document text
    • http://files.marcomsol.com/uploads/1/3/1/0/131069987/pafiz.pdfIn PDF document text
    • http://movitepab.gemremedies.com/uploads/1/3/0/9/130969744/lenita.pdfIn PDF document text
    • http://files.phuketdiveguide.com/uploads/1/3/0/9/130969097/359675.pdfIn PDF document text
    • http://files.greaterstlouisschoollibrarians.org/uploads/1/3/2/3/132303366/3377510.pdfIn PDF document text
    • http://petem.fotml.org/uploads/1/3/1/4/131437087/bularowugaf-tuvabuz-mafexetanowodut.pdfIn PDF document text
    • http://tidorulan.echoecological.com/uploads/1/3/0/7/130739826/3407408.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/8de32480-3b3c-4ec7-9d57-10ea924dcfea/konoguwitefemofawinura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca6becc-1473-4b56-9301-99fd7c2ef77e/42479024360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c14f200-e423-4f2e-bf08-8e9d03809b8e/nuvurirapitalivizisuzefep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff8e6bb-f324-4719-a4de-0e704a6a39e3/jubaxofipolipeleramekod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a645d675-7fe8-4ff1-bd0e-5784233c79a8/wubom.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_off00004fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FEE 5660 bytes
SHA-256: 44c5f090356b1fe051ea4faaa0620a2774366c4df6507eb253fdfef73c9ce61e
font_01_sfnt_off00006304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6304 9880 bytes
SHA-256: a2ac776d4c6d36083a317879e5103ec301938b125cd696cc3630c0515695d6e1

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