Malicious PDF — malware analysis report

Static analysis result for SHA-256 270a1003b6b7d04c…

MALICIOUS

PDF

35.9 KB Created: 2020-08-13 22:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8b7b60be4b416c0b57c37633b612e89 SHA-1: 5c8b54a79d8b9214ba72803fc72462451c2eaaee SHA-256: 270a1003b6b7d04c2455e30d9f00f2d3e4a306d99f5177072f2a3fc35d79cebe
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high density of external links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. Crucially, one embedded URL, 'https://ttraff.cc/wb?keyword=volume%20triangular%20prism%20worksheet', is flagged as a malicious redirector. This indicates the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the ML classifier strongly supports 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.cc/wb?keyword=volume%20triangular%20prism%20worksheet
    • http://files.elshaddaiintl.com/uploads/1/3/0/7/130776200/rikedutabizinejava.pdf
    • http://files.lukegasser.com/uploads/1/3/1/4/131438464/2733480.pdf
    • http://files.elevatingmarriages.com/uploads/1/3/1/3/131380181/xujuxogejekivi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8537/3333/files/76522476404.pdf
    • https://cdn.shopify.com/s/files/1/0436/9504/6824/files/7279275223.pdf
    • https://cdn.shopify.com/s/files/1/0433/7909/7758/files/zuvogopuruja.pdf
    • https://cdn.shopify.com/s/files/1/0432/3645/8654/files/7953571665.pdf
    • https://cdn.shopify.com/s/files/1/0432/6123/1262/files/69549877822.pdf
    • https://cdn.shopify.com/s/files/1/0433/0579/5752/files/andrs_caicedo_libros.pdf
    • https://cdn.shopify.com/s/files/1/0432/1280/0159/files/anatomy_and_physiology_coloring_workbook_chapter_6.pdf
    • https://cdn.shopify.com/s/files/1/0434/1304/5398/files/mazda_3_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/15138334831.pdf
    • https://cdn.shopify.com/s/files/1/0434/3945/6423/files/83123838645.pdf
    • https://cdn.shopify.com/s/files/1/0431/7030/0061/files/46040662335.pdf
    • https://cdn.shopify.com/s/files/1/0431/3903/9388/files/gonatigalumeju.pdf
    • https://cdn.shopify.com/s/files/1/0439/9644/6878/files/wuxujanipulur.pdf
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/28468509110.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fb1.bin
8a4e82712f1cfe3888252f7802098cb7a1f0c063f1f96bdd475ef21ff3e2d0eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FB1 5356 bytes
font_01_sfnt_off000061cb.bin
c208711eba8fba71f971245f18f46a9e8c53140612c9889c45b5aade883ea2eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CB 9720 bytes

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