Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b8e3eb9f58de43…

MALICIOUS

PDF

39.7 KB Created: 2020-11-02 03:32:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0af652b89b66f65af4b67f04ae977ea0 SHA-1: 2bac723856348708a3c97681c6ab078c5997dd71 SHA-256: b1b8e3eb9f58de435177e6b1ad53f3d512682c6bc012467fa772334bc085dd3b
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ggtraff.ru/strik?keyword=sleeperkid+sumiko+wrestling'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, indicating its likely purpose is to lure the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ggtraff.ru/strik?keyword=sleeperkid+sumiko+wrestling In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nalifij/pegifusozu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8415/1452/files/tipos_de_investigaciones.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4400/2714/files/laxujulavevurofo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9929/4369/files/the_chief_culprit_viktor_suvorov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/554c7b3d-14f2-43b3-a7cd-3d365d39fd86/60346534463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a13758-aff7-49ba-a2d2-dd895558b128/mivevumutodur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5795/4464/files/28590526902.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0659/3696/files/que_paso_ayer_2_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05fdba07-60c0-4537-b5b0-99acaaea879d/vusekodituzor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8556/0506/files/minecraft_armor_mod_1.12.2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0a85b7-643e-4467-b0c9-5b926ee67412/vunebazizigeposaw.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D01 5328 bytes
SHA-256: 0f82601f198ed04d4561f1faa41b4260f9116917469131c02f6532f6bea9a27c
font_01_sfnt_off00006f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1C 10460 bytes
SHA-256: 18c91f323ad95af396c93a9f495d6287a50051db388c4edf60f15678d73d2eab