Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b4807ff36ab764…

MALICIOUS

PDF

50.2 KB Created: 2020-10-29 11:13:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8649486c65b8e4bf5e88fb6c1110a983 SHA-1: d87a21c8efb3da120c9bc21aa8b73bbc7f9d6ef8 SHA-256: c3b4807ff36ab764311623b7aa284acefb83e46edf5cf81016b285b57d8c4f9e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm designed for SEO manipulation. One prominent URL, https://cctraff.ru/strik?keyword=nba+2k19+cheats+reddit, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to malicious infrastructure under the guise of providing cheat information.

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=nba+2k19+cheats+reddit
    • https://nojarotawufa.weebly.com/uploads/1/3/4/3/134313922/72e56fe693.pdf
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5f8c18aa90e09.pdf
    • https://nugemezan.weebly.com/uploads/1/3/4/3/134359438/2b18a0bc25.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/8536469.pdf
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/faviwunasuvebesas.pdf
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f8948e71dab3.pdf
    • https://cdn-cms.f-static.net/uploads/4418786/normal_5f99c3d0e254f.pdf
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/029a8e2aab07d.pdf
    • https://jutawalafomas.weebly.com/uploads/1/3/4/3/134316275/c6d90.pdf
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/sipaviwo-kesotaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0486/8256/5782/files/remadujuxotilutopapale.pdf
    • https://uploads.strikinglycdn.com/files/ff73d8d3-ec4e-417b-aaf7-03198249d4be/59625748905.pdf
    • https://s3.amazonaws.com/rujabepifar/4th_grade_math_review_worksheets.pdf
    • https://s3.amazonaws.com/vidadaviwal/tipoturekuxamozewifowojo.pdf
    • https://cdn.shopify.com/s/files/1/0491/9151/8374/files/55269126927.pdf
    • https://uploads.strikinglycdn.com/files/e86eeb74-d381-4fa2-a078-6b93517d03ba/jezodamiwaretabofut.pdf
    • https://cdn.shopify.com/s/files/1/0507/5428/9839/files/69407997744.pdf
    • https://s3.amazonaws.com/wonoti/63263501078.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/armasight_spark_core_review.pdf
    • https://uploads.strikinglycdn.com/files/b475687a-8d99-40c5-84f1-3377e2b339bc/wamafulazitusipepiwun.pdf
    • https://cdn.shopify.com/s/files/1/0507/1942/4672/files/83333452167.pdf
    • https://s3.amazonaws.com/ditiruz/cardiotonic_glycosides.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ec1.bin
308ff433145a4107603e9b6cd07c52f6968baaac9a7ee8dcde9bea3b3f8722a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC1 5508 bytes
font_01_sfnt_off0000917d.bin
187644f248ef466ed5fff464f2540687875c4ff84720527d789dd2ffff5e8149		 pdf-font-stream PDF embedded font (sfnt) at offset 0x917D 15244 bytes

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