Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cb47f1ec401d92…

MALICIOUS

PDF

55.9 KB Created: 2020-10-30 03:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 20502d48db09ffcd421fb5cff0cd6466 SHA-1: 727bd96eac0c9b3f428d25dab3e97bd8042e843a SHA-256: 16cb47f1ec401d92d8da12a227aa0d57c8dfff04c8633717b4e8fb01c4c33532
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for malicious redirector links, specifically pointing to 'gettraff.ru'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the intent to redirect the user. The ML classifier also 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://gettraff.ru/123?keyword=warhammer+40k+rulebook+8th+edition+pdf+vk In PDF document text
    • https://sebonegipuwi.weebly.com/uploads/1/3/4/1/134108682/guled-tixokevo-parutofada-matiji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383921/normal_5f8cfe82146b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/8905/5910/files/shadow_fight_apkpure_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebe39d3a-586f-4865-8d87-96d67e3a22b9/jorajub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/7565/7624/files/batixojajexafedorozuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dbecfbc-0008-4c9d-89dd-7e9243c11f3f/40813583175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b0de330-e77e-4683-ba8d-508e8dc5b045/5036069421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d83b29-d731-4c3f-8c87-496f2a8d0a5f/27185971991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3393/1171/files/tamule.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/viposawavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b88080d6-89e9-45be-8f7a-4ee19604dc31/xewarulemupupovurekuwuvit.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/folawonige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7735bd69-6b4e-43db-81a1-e3e313cd7591/hermann_hesse_narcissus_and_goldmund.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_off0000985e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x985E 5804 bytes
SHA-256: 14fd2f4d1a491f306c4cd05ed2b36dffc40b0d1aaeb2334270c28d2f1f1e01af
font_01_sfnt_off0000ac04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC04 11628 bytes
SHA-256: 5c3df2deea18d99647e1b4102152db35e4338c80fcbbdf5d1f58e94ae2e03c54

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