Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf51a22dc592416…

MALICIOUS

PDF

54.8 KB Created: 2020-11-02 14:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce053aa2baefd8664407abdb7dfc2afc SHA-1: 1c4aa09f63b5fa4f22021b6c35566f3d3c4a406f SHA-256: daf51a22dc592416fe201dc4f3ebb434da68d509df89d3e3a0548d27edd9fb2a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link disguised as a download for 'apk for pc'. This link, https://ttraff.link/123?keyword=like+apk+for+pc, redirects to a link farm of numerous other PDF documents, indicating a phishing or malicious redirection scheme. The ML classifier also strongly flagged this PDF as malicious.

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.link/123?keyword=like+apk+for+pc
    • https://fotobuwab.weebly.com/uploads/1/3/4/3/134368258/xedafofuriretoke.pdf
    • https://cdn-cms.f-static.net/uploads/4381997/normal_5f920ca931635.pdf
    • https://jixidaku.weebly.com/uploads/1/3/4/4/134495137/tegodewunesuz.pdf
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f92e39bb041b.pdf
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f872f5396aa7.pdf
    • https://cdn-cms.f-static.net/uploads/4392854/normal_5f9c2b65a91f9.pdf
    • https://cdn-cms.f-static.net/uploads/4445742/normal_5f9d93266453a.pdf
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/8142125.pdf
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/5081837.pdf
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/vupagepotite.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2bdabc4f-112a-44c2-bb19-58ff3c4b994c/baixar_livro_gratis_50_tons_de_cinza.pdf
    • https://uploads.strikinglycdn.com/files/257b535e-22da-4231-8d3f-e8701fb2f809/lubobuxivefab.pdf
    • https://cdn.shopify.com/s/files/1/0433/7988/4186/files/jetblue_pilot_salary_2019.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009965.bin
1d51078ab075ad06623fefb8d8571cf884ef98eb91712af722c3265f934e7f97
pdf-font-stream PDF embedded font (sfnt) at offset 0x9965 4804 bytes
font_01_sfnt_off0000a9d9.bin
e3a5107d32b5f4414a9d5f2f7ef29b56e62facd3ddd03f543feb0b48ca036844
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9D9 10760 bytes