Malicious PDF — malware analysis report

Static analysis result for SHA-256 8317772b6958de0a…

MALICIOUS

PDF

63.3 KB Created: 2020-10-16 15:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ad8e2edd3487dbb457e77f67d3bcc499 SHA-1: 7511af49b399814af54bc6783af498eeff4d6648 SHA-256: 8317772b6958de0ae080f5cba5ecdd8b2663ed5717e0755795474eacf3f6e64a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on disposable domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these links directs to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains a URL that matches one of the identified IOCs.

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://ttraff.link/123?keyword=origin+of+primordial+germ+cells+pdf In PDF document text
    • https://tenagudewujuga.weebly.com/uploads/1/3/1/1/131164273/881570.pdfIn PDF document text
    • https://mamunazeve.weebly.com/uploads/1/3/0/8/130814121/volupubaxenidiwos.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/kemovekativapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f88296c8dd4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f87080fcd2e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372105/normal_5f88fc6b40b02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f89484771cf7.pdfIn PDF document text
    • https://kusanogiwaxug.weebly.com/uploads/1/3/0/8/130873987/migorajun-munuxekuzuj.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/335308.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/satidekipovegopef.pdfIn PDF document text
    • https://kelobutino.weebly.com/uploads/1/3/0/9/130969458/sugebo.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/a78ed2779e9a8.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/95d20fd0-1e4e-4d0e-b0df-e39e0b04b0a7/62783475130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df421da2-ecc9-4a57-a319-638ca2589eaa/14196925541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b8e430-8429-4b0a-b9f7-7a93768a7ff6/64148126194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c946aa-2544-428a-9e13-758ae65f110c/39245232055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ddcfe3-3b41-4371-955f-836242a4cd0d/60961328011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a99f37c-57f1-4546-a249-b759b77bc44a/15741378952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe6d09d-40be-46ba-b927-b2bc752a8982/76118052840.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_off0000afec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEC 5504 bytes
SHA-256: 2adb45f020baeabedd70aff6f6e4c17ddfa3404d0cbdadfe888fe0c3a9e4e903
font_01_sfnt_off0000c289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC289 14580 bytes
SHA-256: 833e723d3853c908f5fabca04d04ddfe39c5d4481335dccf93089a9991f34e51

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