Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e94e492521b13c7…

MALICIOUS

PDF

62.7 KB Created: 2020-09-29 21:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 42c4b668832f8896e8f57e95919c3ac7 SHA-1: d60615a615d7c3b4698a8aa0959de275c93c5b55 SHA-256: 8e94e492521b13c7c1e61adfcfdc556e05fe45d4db51b77cdbf5928367b95f8a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL which appears to be a lure for a game list, suggesting a phishing or malware distribution attempt.

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/strik?keyword=pandora%2527+s+box+7+game+list+pdf In PDF document text
    • http://files.appliedcosmeticservices.com/uploads/1/3/1/4/131453465/692b73b.pdfIn PDF document text
    • http://files.littleluckydaisy.com/uploads/1/3/1/4/131452934/3693825.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/832a4325-0d8b-4fc9-877a-229075713656/kutomaxugadurirofokidezub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b745f19-1d4e-4367-8049-160583706a72/12589233036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55364961-60c8-4da8-80d3-64ae06b60b24/rizaxobegeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/560f078d-2162-432f-85d6-e01c5f59807e/bezugubelobodogizekubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa97127c-adba-483e-af62-3c4c8213fbfe/36745196030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e53bd441-fd8d-45f1-b902-875cf1b4d051/5056424838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0518aac-a721-454c-9155-ba6a757630f8/36412590775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b041376-24d6-44b6-9326-4d5dbfaf6855/78427252743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16cc827d-9ef3-4284-a6ff-96194e96cd3c/76214339846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2127071-3d48-4b92-a5ce-5619753e8e34/vekozilip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff8551ab-63d9-4166-9d98-804ea0b7490a/65941566752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac79602-cc7a-493d-b4fb-9c5fe7460b57/kikusajojibujin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9328ef3-e3a1-4188-8c13-1f5d9e3f58b7/varetulune.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_off0000a9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9D5 5684 bytes
SHA-256: 0fc18bed89836a05e4051f27acea26f9df0326896ed09d31e33ff22e0a113aa3
font_01_sfnt_off0000bd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2F 15760 bytes
SHA-256: 5513922bbacb24593bc3bd781b67a99e5e35275bf9587687a15e1159c4320fcc

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