Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84c5a5693728f7e…

MALICIOUS

PDF

40.4 KB Created: 2020-08-30 00:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7559e58fdb9568c31e9aa53b605290e1 SHA-1: 7d5d3dddc134859979bb070e7dd4712c88a6bed7 SHA-256: a84c5a5693728f7e89b325be5a375490b5dbaa7c366593ddfb334af3dba6fdb2
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a textbook and the malicious URL. This suggests the PDF is part of a link farm or phishing campaign designed to redirect users to malicious infrastructure.

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/wix?keyword=medical+surgical+nursing+lewis+10th+edition
    • https://static.usrfiles.com/ugd/b8c837_1f09e834ede14f4287359d0c1aa2bbd8.pdf
    • https://static.usrfiles.com/ugd/b8c837_63cf3ecee883452bb691157740fb2403.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6c97b325978480dbf153dd2a6de8c26.pdf
    • https://static.usrfiles.com/ugd/b8c837_714e4135be8f4c96a179b8141231f395.pdf
    • https://static.usrfiles.com/ugd/b8c837_83f05633342643548e1a060c9763ae51.pdf
    • https://static.usrfiles.com/ugd/d54300_41b2d949c56141c591ccb4dff7aea521.pdf
    • https://cdn.shopify.com/s/files/1/0437/5271/8494/files/basic_piano_songs.pdf
    • https://cdn.shopify.com/s/files/1/0435/8320/9631/files/vaxomamofoxaralowapojer.pdf
    • https://cdn.shopify.com/s/files/1/0462/3099/5095/files/6739054516.pdf
    • https://cdn.shopify.com/s/files/1/0431/5919/1712/files/rodek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.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_off00005f28.bin
c1338bfa01b06b09e6f83f862672e6e468601c65ee3fe7550d3910a2359d7a42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F28 5492 bytes
font_01_sfnt_off000071e2.bin
3fb8ab26f78c788763f7ab001540fbd4ca7a50d9975cbb1559490395c69d2d03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E2 10240 bytes

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