Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4007de90c01387f…

MALICIOUS

PDF

70.5 KB Created: 2020-10-29 12:46:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e7ec67d78a6c4af2fe96133fc1574740 SHA-1: dcff42837d48bcd1db434411ca4696da73fb3e13 SHA-256: e4007de90c01387f1d58cf5131120c474695800dc4e1f3172ee5ed388c3b1ecf
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://cctraff.ru/123?keyword=minimum+wage+in+walnut+creek+california+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_5f9692fba24c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f8c8805ef65c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389792/normal_5f94521ac8203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416128/normal_5f96803a7a4a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5f883a1179c1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409395/normal_5f95d2ed15dfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374380/normal_5f8a27c958e02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5f89aabd8c871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_5f89fbc9ec1a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1cfc8a57-2b2e-45d9-9f65-afcdc41dde0b/71303802016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7da7f32c-10cd-4fc9-8e0b-24da138aa6dc/flexus_trumpet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac18093c-14c4-4814-8a18-3a820ecebf25/great_building_guide_forge_of_empire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ff4cd0-5ae0-4510-9280-315bafe0b99f/ryno_card_locations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de848c4-5744-49f9-b9bc-1c89537ae714/texuselidovola.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7764/1385/files/14971261771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc0ed1c-06a0-495f-8635-38106fc3955b/dabajugipawojobib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2650/4616/files/1394179557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a9ef4d5-bd87-4f6c-bdcf-df70cdf7152b/13026492895.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC465 5548 bytes
SHA-256: f8c8d6c40b5f2e44439cf2769f22b8c29c2e797015525338b6b194769c06a12f
font_01_sfnt_off0000d741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 11500 bytes
SHA-256: d821b1e67991e52e4356ce9c0ef3ed760fea9cea004cde5b517c662c55c490ba
font_02_sfnt_off0000fe4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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