Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c66db14b6fae825…

MALICIOUS

PDF

46.7 KB Created: 2020-11-01 23:55:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 14912600e202a5a912b35ad0a95320ec SHA-1: c30b3aa9fbedfeabd115022b6787d128248d4fdd SHA-256: 6c66db14b6fae8259c954e9d3e368bccd97f7a167bf88bef9a60ab41cb1b0251
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains URLs that are part of a link farm. This suggests the primary purpose is to lure users to malicious sites, potentially for phishing or to download further malware.

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://ttraff.ru/123?keyword=gif+keyboard+apps+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391903/normal_5f8f058a8bafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_5f996e37cc0c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f876508d7b17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371023/normal_5f8bc6f968445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5f8754bd67378.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8078/7116/files/hp_lovecraft_bestiary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d6d114-5c8e-4990-8329-e2cc130657ce/jones_meat_market_in_saranac_michigan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5807142-f734-49c7-98b1-66a38cd6aa06/bao_nhiu_nh_bng_chi_ph__califor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3bb818-8523-4dd6-8ccf-6e76700859b8/fonuxukimos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9628477e-477d-4802-9f27-0fed83a41c1f/bobironowub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/9355/6893/files/munshi_premchand_kafan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e600a1db-2ede-41fc-acee-1c491bf38d8c/fuxokigupofokofoxudekiwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2693/2124/files/history_of_mathematics_in_tamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7605/1627/files/brainerd_high_schools.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6134/4406/files/memizofobunasuweb.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6170 5340 bytes
SHA-256: 1c407b9760beda0e6fcb362dc7837bc548c57a3018da2b50085c6c3d161d0178
font_01_sfnt_off000073b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B7 10404 bytes
SHA-256: e15488a57fa9e911b51fba5d01fcabb071f9026993b43c53a6cade196bf5f9c3
font_02_sfnt_off00009779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9779 16544 bytes
SHA-256: 1b44218257806f750c7fedc2cca84b6b30ff477c2da870f9e14c0541087d9c9f

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