Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d1677bb97ad974…

MALICIOUS

PDF

36.0 KB Created: 2020-09-26 23:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01f3932ca109f7c46e74e758f28a4ba7 SHA-1: 6a123195015f2540ba6cf2e13b78e6da6ad953ce SHA-256: d9d1677bb97ad974ab0979e362012f7e8c1c71e2d8510740c05b37652437ad94
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as an answer key for a math lesson. This suggests a social engineering lure to direct users to malicious content. The PDF also contains a large number of external links, many pointing to Shopify domains, which is indicative of a link farm used for SEO manipulation or to host further malicious content. No scripts were extracted from this sample.

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/pify?keyword=lesson+10.1+slope+and+parallel+lines+answer+key
    • http://filumux.ellesbookblog.com/uploads/1/3/1/4/131406515/7682345.pdf
    • http://files.seedsofhopefdn.org/uploads/1/3/0/8/130814984/b1a9ea32523e0fd.pdf
    • http://jodilux.petersburgpowerwashing.com/uploads/1/3/1/6/131606003/6778484.pdf
    • http://files.charlotteellispr.com/uploads/1/3/1/6/131606360/9719ba.pdf
    • http://nunivaf.eyeslikemineinc.org/uploads/1/3/1/4/131437914/tuxolajazedipaw_gowob_xenagabuganor.pdf
    • https://cdn.shopify.com/s/files/1/0441/4416/5016/files/zuwulepifage.pdf
    • https://cdn.shopify.com/s/files/1/0434/4807/4396/files/principles_of_amputation_surgery.pdf
    • https://cdn.shopify.com/s/files/1/0480/7488/3236/files/30656766637.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2861/files/976442716.pdf
    • https://1d336543-e867-4cd5-9449-6ee2f1b8efcc.filesusr.com/ugd/9c66ff_01cfc1a447d04e27b087f6d5ec412a14.pdf?index=true
    • https://8717b3a1-1e1b-40bb-92ec-735c47083f85.filesusr.com/ugd/3f80ec_90c2bd2a80fb40efa0e8d2bca18da2b5.pdf?index=true
    • https://4e1901a8-f8bb-47ac-9ee5-7e5d1fc4aaa1.filesusr.com/ugd/b47706_99d92f0ed91a4d249c5a23f98c7a942c.pdf?index=true
    • https://8b13881b-0d67-473a-abc0-d581c93a627f.filesusr.com/ugd/93971e_aa1dd502086e4815b5fca8dbe7b35f74.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_off00004ead.bin
48b55878e4c72fd149944633fef748f805f100cc8b3a3e57e7c5fdd9cb8a2ef9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EAD 5380 bytes
font_01_sfnt_off00006128.bin
015a25fd6b5c81c3391132c5b6f61a168ed793779022623bc2ea70d01fd9ff9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6128 9900 bytes

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