Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90ac73f4bff79ea…

MALICIOUS

PDF

41.5 KB Created: 2020-11-04 07:04:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9db71789abe68510d28473a984ab5868 SHA-1: 150c4ddc3e2a7227928eab140afcde86083fdb5e SHA-256: a90ac73f4bff79ea1329597a1a42480d3b74bc936bb5ce2ecdec99c676f285f7
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a lure for free in-game currency, which redirects to a known malicious domain. The document also functions as a link farm, pointing to numerous other PDF files, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness.

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://ttraff.ru/123?keyword=apex+legends+free+coins+xbox+one In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f9dd5cf241bf.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/20c890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5f976f59bbd18.pdfIn PDF document text
    • https://gimunoje.weebly.com/uploads/1/3/4/3/134344093/644906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f8b1d877d50e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_5f91d45b3baf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372354/normal_5f896d1cc104a.pdfIn PDF document text
    • https://jedotulaxadetin.weebly.com/uploads/1/3/4/5/134587896/lafifekuxag.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/bojafazes/payroll_system_documentation.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/corey_wayne_how_to_be_a_3_man_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/802324a0-4ace-4c6f-a3dd-106540c9a719/miromu.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/9397013683.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/analgesia_and_anesthesia_in_obstetrics.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/79588059834.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_off0000653a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x653A 5312 bytes
SHA-256: 6987b533896b6a0101530d429116e1567e72e46d78f7f0ba285883a46ce6f00c
font_01_sfnt_off00007762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7762 9968 bytes
SHA-256: f38ea40139c351c4c490c5b38e0d393647b65432354a16989e25f89677c60873

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