Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef03b1b6fab2644…

MALICIOUS

PDF

47.7 KB Created: 2020-10-08 20:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 41ea7fcd52e9e63e11bc536944fe9be7 SHA-1: ba2951d371eb8866dc32f613601dfeb063ff4369 SHA-256: fef03b1b6fab264466b0e8987b55a8ef6ace43def6fd410b3e56ee3959e2f417
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://cctraff.ru/pify?keyword=quotes+for+your+crush+for+him'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links, many benign, indicates a potential link farm or SEO manipulation tactic to obscure the malicious destination.

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://cctraff.ru/pify?keyword=quotes+for+your+crush+for+him In PDF document text
    • http://files.ourchildrenshomestead.org/uploads/1/3/1/3/131379397/8313f4f.pdfIn PDF document text
    • http://files.nellarouworkingdogs.com/uploads/1/3/0/7/130739678/defurogupegu_powarop_jalerakejutef.pdfIn PDF document text
    • http://files.iesagency.com/uploads/1/3/2/8/132815791/5913404.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8062/8889/files/47817323119.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6668/3292/files/wemeniwoserem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3400/8987/files/zapegefarobesod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6992/3743/files/miller_trailblazer_302_diesel_parts_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6317/6085/files/xanududowotuvafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe70fa5-d350-4ac0-aed6-0a8b1e59c496/10442549588.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5838/0450/files/setss_nyc_doe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8396/7896/files/wonder_book_accelerated_reader_test_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5381/7749/files/how_to_apply_vinyl_decal_printable_instructions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76D5 5040 bytes
SHA-256: 0ed27fc62439d9a4e815d3a7194732d318593f721719dc6694446b2b8ae87311
font_01_sfnt_off000087dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87DC 1796 bytes
SHA-256: 68bbe42c93759ab90c218695aa25c1747b40456063d11b0ac06b51d2514fd3e6
font_02_sfnt_off00009066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9066 9732 bytes
SHA-256: 847287fe7fc0eed031320f4e09e8127b5478de607ede623c729cdde7fc9366ff

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