Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f853701097aca3…

MALICIOUS

PDF

40.1 KB Created: 2020-08-30 17:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 320ed6df78883fa57df25507c9f355ff SHA-1: 9fc12fd256641b3c3b71de6af1b1176ab4c36e30 SHA-256: 05f853701097aca331b13412b9f9c7de2b840f721a53d6ef761f862aceac471c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading a system driver. This suggests a phishing attempt to redirect users to malicious sites.

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.me/wix?keyword=microsoft+acpi-compliant+system+driver+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8673/2707/files/98784615149.pdf
    • https://cdn.shopify.com/s/files/1/0432/3059/3192/files/fabowafajixap.pdf
    • https://cdn.shopify.com/s/files/1/0436/0064/2211/files/29596496361.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2220/files/adivinanzas_para_nios_cortas.pdf
    • https://cdn.shopify.com/s/files/1/0431/1246/4535/files/excel_gantt_chart_template_hourly.pdf
    • https://cdn.shopify.com/s/files/1/0437/9561/1810/files/menubet.pdf
    • https://cdn.shopify.com/s/files/1/0437/0690/8826/files/envision_math_grade_4_workbook_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/6535/1075/files/back_end_developer_handbook_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/15509530651.pdf
    • https://cdn.shopify.com/s/files/1/0437/8873/0525/files/advanced_calculus_fitzpatrick_solutions_manual.pdf
    • https://static.usrfiles.com/ugd/b8c837_6902fd47bee947a9aeb8e43c9f1216b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_8fba20c10aed4626bec197012fb0036f.pdf
    • https://static.usrfiles.com/ugd/6cfc61_fae9f69b013b45148265d8856fb1144b.pdf
    • https://static.usrfiles.com/ugd/a48928_87586509673e469b947802776a0a9bb4.pdf
    • https://static.usrfiles.com/ugd/97634b_704e511f89b04e63a40292b0d6b2d5dd.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_bf732975efec48aeb900166b59796990.pdf
    • https://static.usrfiles.com/ugd/516574_946d01d4ba2a4cad82f1a01a6d541ce0.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_off00005571.bin
af17d3cc430ef0592ed9b22f1f5618e0fc0cc69a58660a5fde68fe8fa70a928c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5571 5592 bytes
font_01_sfnt_off0000687f.bin
808aaf9e6c38f13116c9051024e4d9fddba7ec5f959d2ed7d16585ae6192694f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x687F 13432 bytes

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