Malicious PDF — malware analysis report

Static analysis result for SHA-256 e482a9f5bf8191f0…

MALICIOUS

PDF

40.4 KB Created: 2020-10-04 13:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: da81da41dc763a3f506a47795f9e2737 SHA-1: 65b0e5a82b84cce1497047d92f0a31d100a34c21 SHA-256: e482a9f5bf8191f0de1942076acd943fe80797c055fa3c0fc91cafc53b0378e4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body text and embedded links suggest a lure to external websites, potentially for SEO spam or phishing.

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=hanson+marathon+method+pdf In PDF document text
    • http://raniti.journeytothethrone.com/uploads/1/3/2/6/132681311/4667846.pdfIn PDF document text
    • http://mokakut.mcgrewhouse.org/uploads/1/3/2/7/132741269/wopomowibadepexib.pdfIn PDF document text
    • http://guwitu.neweverymorningdls.com/uploads/1/3/0/8/130873915/09736.pdfIn PDF document text
    • https://site-1041777.mozfiles.com/files/1041777/33798236899.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/caf0f606-9b43-4c00-b129-1eb1b66ecdec/81940609150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d2dc58-7c36-45bf-9791-b118472a5b12/goxujukiwafujunebivuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d1eb99-fd47-4dd2-9e38-03e6fe487fa2/96097451005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea260c98-4170-4c54-91e8-27b11dcc499f/zagotulerabedutusipotaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f06438-98fd-4bd4-a4b5-ae53ba469fec/nawovawib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/732cbe74-a535-408a-84c2-cbfef022bb30/lajixakazopebosug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f49247f-bd32-4b11-9fde-79e329b52ec0/1287178788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f036cab-b6b2-403a-8443-d9fec2367f0a/dofujumon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/926769cd-6ab6-415e-9af7-b13c48b5e67a/30474886347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c303517-602b-4133-aecf-eec34f8f1388/nubijasunejixeboxenobe.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_off000060f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F3 5212 bytes
SHA-256: 9dc24f4900155c4d68742a319ed08fbe062f397e3d24c64cac21d091c250a9e1
font_01_sfnt_off0000727e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x727E 10148 bytes
SHA-256: 63b345864b6e42eb5d1dfb405bb35d84a09ca60416eb91fdc04a796e9499ea85

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