Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c5a21bba652c19…

MALICIOUS

PDF

35.7 KB Created: 2020-08-26 18:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 640b4ea93f3969b6ab0233f60428107c SHA-1: 799515ecc90b5032aebb47ecd15fa9c0a37bbabc SHA-256: a6c5a21bba652c199b57938d0a8a032c8ec5ba0c25ecd5a591d2d087a58ce43a
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary heuristic indicates that these links lead to known malicious infrastructure. The document body itself is largely unreadable but contains a URL that matches the malicious redirector. This suggests the document's purpose is to lure users into clicking malicious links, likely for phishing or malware distribution.

Heuristics 3

  • 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.
  • 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/pify?keyword=texto+o+anivers%25C3%25A1rio+do+seu+alfabeto+para+imprimir
    • http://files.michaeljamesoberhauser.com/uploads/1/3/0/7/130739616/3660701.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jaxigosileworu.pdf
    • https://cdn.shopify.com/s/files/1/0464/6921/8454/files/diocese_of_pittsburgh_curriculum_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0431/8022/8759/files/az_mvd_revocation_packet.pdf
    • https://cdn.shopify.com/s/files/1/0438/3119/7856/files/korean_learning_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/darisokezujowekaxapupe.pdf
    • https://cdn.shopify.com/s/files/1/0432/2315/4850/files/vidmate_movie_er_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/kijolevufetidoki.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/curriculum_vitae_format_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0429/0812/3303/files/gopurevemi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4778/8450/files/gaxolilarobefesikokade.pdf
    • https://cdn.shopify.com/s/files/1/0435/3835/0231/files/lafisodojotobuwawil.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/kemiwekak.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6817/files/daxitojadedeluwagedu.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_off00004aad.bin
7121d46306a6bb9c5a687f5d579d07d04ddeece322e1bb92b78683051aad0e76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AAD 5640 bytes
font_01_sfnt_off00005d36.bin
9cd99d7f89f3a6359f56beec34cdcada1dff6555a3a2504750dad40492aff378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D36 10952 bytes

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