Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b2d6df95ebd9ce…

MALICIOUS

PDF

38.3 KB Created: 2020-09-18 16:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04f07bed93452218ecb2324d1f1ab7b9 SHA-1: acab1ca47309a466e2f82eb1811f99d66213f57c SHA-256: a7b2d6df95ebd9ce6d9125de2249b63190c5fb9844cf2477a00d16bde3303eaa
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'area compound shapes worksheet answer key' and a URL pointing to a redirector. This indicates a social engineering attempt to lure users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.link/wix?keyword=area+compound+shapes+worksheet+answer+key+with+work
    • https://cdn.shopify.com/s/files/1/0430/6334/5301/files/22525667474.pdf
    • https://cdn.shopify.com/s/files/1/0436/8069/4437/files/pewanifilobabifazuledo.pdf
    • https://cdn.shopify.com/s/files/1/0463/6806/3643/files/5263989652.pdf
    • https://cdn.shopify.com/s/files/1/0431/7275/7668/files/27965149396.pdf
    • https://cdn.shopify.com/s/files/1/0440/9737/2312/files/8101572306.pdf
    • https://07790026-fc73-4a53-bd77-16991ec1336c.filesusr.com/ugd/fb5067_d494449ea67c495cb59af087e9a5bfdd.pdf?index=true
    • https://2c61306a-2a01-4224-bc04-6c8ab2fd7172.filesusr.com/ugd/c6ac46_6d336d9d73c0476e99aae78aea34eb2e.pdf?index=true
    • https://cb20c2f5-60e3-497b-889f-9d91db14d9a5.filesusr.com/ugd/debbe1_bc101dc07a9043b4b671f8030572c628.pdf?index=true
    • https://1f112359-ab5d-41d8-a013-ffffa04f8f8a.filesusr.com/ugd/bc0b97_daf19d3a0525455eb7be474809438a3d.pdf?index=true
    • https://a9476782-a7f0-41bb-85c7-863b0c81769a.filesusr.com/ugd/469aea_3cced67c722e4b8ca2bcf02b6a319119.pdf?index=true
    • https://16eab3ea-a335-4c79-92ab-ac2d39207daf.filesusr.com/ugd/136d07_5efccac7a603430390646e5255962f00.pdf?index=true
    • https://06470bd1-b283-4c12-8557-d98722b7e2c7.filesusr.com/ugd/c638b7_33533230460847f5a62019133bee7ee1.pdf?index=true
    • 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_off000058a6.bin
b91eddfaa01b129c952dd4f4226710b520749903a96cead5b091b084850200e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58A6 5528 bytes
font_01_sfnt_off00006b57.bin
fcbfd742941ea024f2da746d9ca9e40c9a727676dc28b5f3e203517b8ad31fda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B57 9688 bytes

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