Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48db1e5f25c1fa5…

MALICIOUS

PDF

42.2 KB Created: 2020-08-29 09:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 932c45e91e43afcc3759d7840945ee2a SHA-1: ae298381bdd500607809ead3d7f6e1b9f0b18816 SHA-256: d48db1e5f25c1fa58350a7e30fbf51be68b3c5a60c75143f74449920694b8f8f
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 external resources. One critical heuristic identified a malicious redirector link, suggesting the document is designed to lure users to malicious sites. The document body, though partially corrupted, contains text related to 'math worksheets for 4th grade pdf', likely a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL.

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=math+worksheets+for+4th+grade+pdf
    • https://cdn.shopify.com/s/files/1/0429/5501/4298/files/metode_agile_development.pdf
    • https://cdn.shopify.com/s/files/1/0435/2435/8298/files/giwavuwixezegijege.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/24766488256.pdf
    • https://cdn.shopify.com/s/files/1/0431/7141/4173/files/26791680382.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69901941500.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa3fb086e5084a0b94d9a5591e085945.pdf
    • https://static.usrfiles.com/ugd/b8c837_105d74402fd94bba9a829335a45557ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4dda66298124c45b7c90b0a0761bc49.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2b2b8676d444187bcf64dca853dca44.pdf
    • https://static.usrfiles.com/ugd/b8c837_de1b9a0b4bb54887a411e28c7aac9658.pdf
    • https://static.usrfiles.com/ugd/b8c837_78becd815b094071a59ceb8afbc0b874.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0c8a07c63bc4490848aecc2d8d2a1b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ea5777895734987afa900059ddbf9a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d0110ccc70e491da8c19d887a9b0a4b.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_off000064cd.bin
1cfca2d32d706a925184637ea99337e7416c73f22e138a13c8843e5cb8ca545d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64CD 5520 bytes
font_01_sfnt_off000077b1.bin
6293f2e7d63ed341b9efba5119422a196ac75adbf1bd274268deaab7f343b03c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B1 10612 bytes

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