Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c3ffcab18fcd6f…

MALICIOUS

PDF

45.0 KB Created: 2020-10-30 06:17:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fd491780e82ed18f501f729fd9cc022 SHA-1: 71a87c220444b5aa77391d845ad3d17c831162a2 SHA-256: 93c3ffcab18fcd6f717fe353bd0efe6b3de3c58ce2a0d9758a85189293549ffa
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. The embedded URL, https://cctraff.ru/strik?keyword=analyzing+text+structure, is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware distribution site. No scripts were extracted, and the document body was heavily obfuscated, making further analysis of the payload impossible from static inspection.

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://cctraff.ru/strik?keyword=analyzing+text+structure
    • https://cdn-cms.f-static.net/uploads/4382638/normal_5f8ee5876905b.pdf
    • https://cdn-cms.f-static.net/uploads/4383451/normal_5f93bcb6afbac.pdf
    • https://cdn-cms.f-static.net/uploads/4372105/normal_5f886749b77e5.pdf
    • https://cdn-cms.f-static.net/uploads/4379846/normal_5f8ff556bb377.pdf
    • https://cdn-cms.f-static.net/uploads/4412570/normal_5f9a2591647d8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0268/7565/8424/files/complete_guide_to_aromatherapy.pdf
    • https://cdn.shopify.com/s/files/1/0495/9977/4872/files/family_tree_wall_decal_with_picture_frames.pdf
    • https://s3.amazonaws.com/jedobufudajewu/glencoe_osmosis_virtual_lab_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/5258/1542/files/recall_definition_ap_gov.pdf
    • https://uploads.strikinglycdn.com/files/855a5465-eeed-4a69-bf80-d12d9c086b37/anova_with_bonferroni_correction.pdf
    • https://cdn.shopify.com/s/files/1/0467/8038/3385/files/62029341463.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_off00007239.bin
808bd6c3bb614e272c5c0583d05dc8771913124ce54de2221ee1891b03a790a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7239 5176 bytes
font_01_sfnt_off00008401.bin
357cd92636e22336d1caff37fbec0736759428c1b5d2db2955ea554bea3e3a97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8401 10732 bytes

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