Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e2a8789553a7a9a…

MALICIOUS

PDF

66.7 KB Created: 2020-11-13 15:37:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 423b4ca359af0daec2dd7297d88efc02 SHA-1: bfacb4d94baa4ba68add750402f6e94600aef67c SHA-256: 1e2a8789553a7a9a1775f2058e45f5d910d7d941e82d7463484645ef71921b07
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a 'chess game for windows'. The presence of multiple external PDF links, many hosted on S3, indicates a link farm designed to distribute or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=chess+game++for+windows In PDF document text
    • https://nometoxuf.weebly.com/uploads/1/3/4/2/134266561/6894760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f8710441bb51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/raze_2_kongregate.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/99751304276.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/tesukunumevelatamulokus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1739b0f-2962-4e85-8213-fd6245f52099/free_amharic_orthodox_spiritual_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c7db0ac-8d11-4eb1-9de9-cd1c07762eed/danesijamu.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/bluetooth_transmitter_for_pc_and_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/45161768258.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/6983602358.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/zaremisito.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/22391364903.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/pujavaxepowopin.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_off0000c7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A0 5288 bytes
SHA-256: 16f18ec39e6da91c3f4cc631a5fbbd028725fe61c3346cb4f1347922956c9f2f
font_01_sfnt_off0000d97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97F 10780 bytes
SHA-256: 949bae2c5fd9817404ec0c331445a87f12f35263f18406459f9004655f334a01

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