Malicious PDF — malware analysis report

Static analysis result for SHA-256 b907f62ffb583d7d…

MALICIOUS

PDF

36.1 KB Created: 2020-10-31 05:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8c6f21fb08a00820c5b6d0499e0f8774 SHA-1: 76500d88d4b2bc30b38b8696fdd1d60814386e12 SHA-256: b907f62ffb583d7d99a48f5339d2368901f98857b0a91154878d8d9f109f132c
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, forming a link farm. One of the primary links, https://ttraff.ru/123?keyword=mclain+high+school+lakewood+co, is identified as a malicious redirector. This suggests the document's purpose is to direct users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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=mclain+high+school+lakewood+co In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f8a89cdb9794.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/8a81413.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/c6d1bd31-5eec-449f-acec-9e39bff4e733/bijesosurazopibubaliteba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9847/0555/files/15071280456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637dda92-9354-4704-b8ff-a3696478ece5/nixafobuverirunanubiroza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9081bc66-fab8-4a63-80bc-b721a6b4deeb/onkyo_rz820_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7111/0310/files/72886082649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/933bf2b1-29fa-4a5d-99b3-3a033c9f7c0a/45685811700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af1c0f8-b50c-4e95-a778-069518a4ac91/13673587302.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8175/3288/files/vemovamusidonakiriruzivam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4974/4062/files/44153462264.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_off00004f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F18 5264 bytes
SHA-256: c03fb959338f0abacaea131e8c807d0ca211ced75b7b85cf52c953f081ec7ffd
font_01_sfnt_off0000611c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x611C 10288 bytes
SHA-256: e9548378a859ae5d3c8209f7b454e23d37d9a8a87cf359c6f1012e2d046f8f92

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