Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8447cee822a7b4…

MALICIOUS

PDF

35.3 KB Created: 2020-10-29 10:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1d8ebb943c56028f762cf8e680eca9c1 SHA-1: 752d76590d43aff189e10668051bb79234e79590 SHA-256: 7c8447cee822a7b48cde6429bc6448515ce6b4adb13267371c2202582eb854c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a campaign to drive traffic to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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://cctraff.ru/strik?keyword=4+days+to+go+gif In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_5f9a113d165ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f932998119e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5f8d46d02c5d7.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/542178.pdfIn PDF document text
    • https://mizunawakore.weebly.com/uploads/1/3/1/4/131406356/solanegow.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/89e872df-5fb4-4d3e-86cd-a5a2b365a61a/fnia_visual_novel_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dfd76b5-c758-4ddf-a5d2-0272e44ab086/coi3_compound_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368090a3-4c7f-4958-a5db-c00c33e91a49/19470599605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/067ec9d3-7319-497b-9496-2a185854bb08/psychic_pathfinder_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/xujefakukuvabugedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/267b55c0-9ced-4c4e-a7c9-5818f0ee6c2b/vatutunipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/454c4b91-e2c8-4640-b2e3-1ceeae20acaf/palace_of_the_dead_guide_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39fa8500-34bd-496b-a5fe-f3215a196b10/70318965451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89538b5-8c69-468b-a8b5-2681fec0dc18/24867129894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/018eaa5b-5fef-4ba4-b261-e606b1769e82/minecraft_pe_0.14_0_apk_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cb4f917-20ac-48a8-a58c-9ecaa2a0d2ab/65072109749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/682c1f48-2837-4101-a5ed-27905d5ca2b8/10584632829.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_off00004dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DAE 5044 bytes
SHA-256: f80dc92f49fcb1629b6d64d17f8ebde603d2bdef3a5650b4328de9dd636535e8
font_01_sfnt_off00005efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFE 9784 bytes
SHA-256: 707c1264a7c86575e14e8538b6913ed8cc34774c59afabcac9349fad64e022e7

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