Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0857cace14a9a6…

MALICIOUS

PDF

46.4 KB Created: 2020-08-22 07:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0159f345eec9ed9d84e219b27a1a9205 SHA-1: b18cf43ee16014e5effa0c5b5019c4fde5c50609 SHA-256: 7c0857cace14a9a611dd84ea661510e65522bf234f4d7354ba32e6a3a4dc2185
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is ttraff.com, which is known for redirecting to malicious content. The document body, though heavily obfuscated, contains references to the malicious URL and other Shopify links, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=ascender+sans+wgl+regular+font+free
    • http://files.whimsicalsragdoll.com/uploads/1/3/0/7/130775182/ropegizulomexu_palini_vigise.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/6164/0358/files/architectural_record_february_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/2089/4886/files/49186376294.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/microsoft_excel_2020_formulas_list_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/91171152062.pdf
    • https://cdn.shopify.com/s/files/1/0430/5525/1605/files/53454882528.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/bijuruxolebedinowisiti.pdf
    • https://cdn.shopify.com/s/files/1/0436/7430/4662/files/time_limit_for_reporting_accident_at_work.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9870/files/89993212839.pdf
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/xodipexumedu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0155/1771/files/mupasarekovifabe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wanojexabe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zutazalurofesavasa.pdf
    • https://cdn.shopify.com/s/files/1/0436/8649/4361/files/58565890636.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005948.bin
65c4fb6b688c80be8c1ba566a2fa221b52d6f9fd9d0b56c7b1cfbeeb27b5a0a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5948 5104 bytes
font_01_sfnt_off00006aba.bin
eec127205ddd15c27039650bee006a774b6b6b4e1fb2a243beeaec893c69973a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABA 16564 bytes
font_02_sfnt_off00009d0c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D0C 4324 bytes

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