Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1a61f355bff5e9…

MALICIOUS

PDF

50.0 KB Created: 2020-11-05 06:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: df190a669d536ac21c7cb9c647d38e51 SHA-1: b836c54bec08915da784daf910cc8f39d6340756 SHA-256: db1a61f355bff5e95572e9a7b300fa3768c81013048b0b57939b81a83c650d6b
124 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier as malicious and contains embedded links pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also listed as a suspicious IOC. The primary attack pattern observed is the use of malicious links to redirect users to potentially harmful websites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=loomian+legacy+discord+servers In PDF document text
    • https://derutibedevore.weebly.com/uploads/1/3/4/3/134354066/4213725.pdfIn PDF document text
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/35538.pdfIn PDF document text
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/f2d5a8f7a66cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427811/normal_5f980ab979f0a.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/fexogititezijufobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5fa33871bc32a.pdfIn PDF document text
    • https://gugukufetufa.weebly.com/uploads/1/3/4/3/134337187/8587112.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/april_month_current_affairs_2019_in_tamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2087/7465/files/84331949736.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/gizidaxagibujejago.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/91742692134.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/adobe_acrobat_reader_viewer_editor_creator_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/kumpulan_cerita_dalam_bahasa_inggris.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C16 5364 bytes
SHA-256: a5fd3266e7192b180614c4b2f3621224fef73e1bdb61d5231c4a851782eb320d
font_01_sfnt_off00006e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3D 3688 bytes
SHA-256: eb9791e505e17ca5ff8129505fb25695d5a6ce821973b517d8ee24235e712731
font_02_sfnt_off00007cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC5 11048 bytes
SHA-256: 6bad3a5c2d865dcb11dd2056a341eb88c3a919c4d8850e579cc02a3a896da5dc
font_03_sfnt_off0000a2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2B3 16928 bytes
SHA-256: 223a1e29275dee42986c48c70b1b49dda93b6302d942508ec57330dba5b2dd82

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