Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcec9985c05d675…

MALICIOUS

PDF

49.3 KB Created: 2020-11-01 15:09:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff95f92d2282847e5a89749de513f15e SHA-1: 58a821924a53677c620d737e012e8c18a6422969 SHA-256: efcec9985c05d675f0487b15f3f5133eb0a7c2cf2e084d59114f37e5388e3c50
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least two identified as malicious redirectors. The document body, though heavily obfuscated, contains a URL that matches one of the identified malicious links. This suggests the primary purpose of the PDF is to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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.cc/123?keyword=love+inshallah+pdf
    • https://fezuxikazosulav.weebly.com/uploads/1/3/1/3/131398093/9928535.pdf
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5f99a45faac4d.pdf
    • https://cdn-cms.f-static.net/uploads/4392667/normal_5f9df7375146b.pdf
    • https://cdn-cms.f-static.net/uploads/4404502/normal_5f981c7a3a539.pdf
    • https://cdn-cms.f-static.net/uploads/4413564/normal_5f96f85915e6b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pazifetanegapu/suwexikizetode.pdf
    • https://s3.amazonaws.com/fasanag/wetherspoons_menu_prices_2018.pdf
    • https://s3.amazonaws.com/tojabixefova/how_to_make_a_book_out_of_files.pdf
    • https://uploads.strikinglycdn.com/files/3d6a9421-7337-4aad-8a2e-c739b593eb05/tafowelewogogubadiz.pdf
    • https://uploads.strikinglycdn.com/files/733809c2-5db0-4ce2-8eb4-442fef06ed9d/kk_pure_mini_preamp.pdf
    • https://uploads.strikinglycdn.com/files/8ef24940-1bcf-4342-a6e8-57ca69d897d1/tojobedur.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_off00008363.bin
10d0513bc1d1ad5da2f863676206f13054bb9948d39cc186764b15e3b9cfc51f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8363 5036 bytes
font_01_sfnt_off00009494.bin
c1df09d8e808eaf7a06c998917e1de3b3ab93481a1d4e6720bfded2e418b878c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9494 10576 bytes

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