Malicious PDF — malware analysis report

Static analysis result for SHA-256 240905ebe8f77f9c…

MALICIOUS

PDF

43.6 KB Created: 2020-10-20 04:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: efcdcf63097428e628f4b8f425f445b6 SHA-1: 0c0d5e5fb0b9e9a1129f11c05b13b2effaf65a1a SHA-256: 240905ebe8f77f9c878221da5ac9b7cabd9d14b29b53e84496dcd9869713e3bf
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://gettraff.ru/123?keyword=hum+aapke+hain+koun+movies+hd, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links.

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=hum+aapke+hain+koun+movies+hd In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f88104db3891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_5f8bdeb0a63ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375196/normal_5f8dfed0a6883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_5f8d11b06e00b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_5f8e297e9b902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5f87650659ad1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_5f875d1e5fa79.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/1/0437/4423/1575/files/ramps_1.4_schematic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7236/0093/files/jomujawed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6457/3593/files/95961345343.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7569/7830/files/ge_dishwashers_recalled.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/3870/1216/files/deezer_mod_apk_2020_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac339dd-f826-4eb0-820c-c55478ba59bb/76408461960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56585774-6af4-4a0e-9e9f-c13953e07edb/2540598539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c668df4-9e9e-43b0-a623-700330d923c4/camping_merit_badge_requirement_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ec90bc2-24e8-4912-a03b-75f65cc1f970/zijil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89a3a145-d396-4cd9-a806-5e42123bc780/50017997890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac913036-2e35-462b-8a19-7866e93c3ce0/voloradugix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e2badb9-64cc-4420-a582-d986bb911648/63807046382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed0f038-c7c6-4331-8367-b69961432227/38212431577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f50f95-ac9d-4635-bcbb-768e15011744/piwijofepefukujemexex.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_off00006d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D75 5156 bytes
SHA-256: 9946747170f6a3fcfae96d26d647bf30cdc2ad9011efc903489fd3628105f098
font_01_sfnt_off00007ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDE 10076 bytes
SHA-256: 172bbabec2c937b330374ba0ff7bb657a2027ced115b46e27209f6e1eae1d98e

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