Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a8b1effb256a2c…

MALICIOUS

PDF

42.0 KB Created: 2020-09-06 03:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 993f603fe0649af4fbe3e01c75771d15 SHA-1: 754e6f779701a14023f7d96ed225700705ec37ee SHA-256: 91a8b1effb256a2c67a862da2257b0d1266d19b6957621e55f6c013cd220845f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link to a known malicious redirector, ttraff.me, disguised as a legal document template. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or social engineering attack. The document body, though heavily obfuscated, contains the URL that is likely intended to lure the user to the 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.
  • 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.
  • 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/pify?keyword=colorado+deed+of+trust+template
    • https://static.usrfiles.com/ugd/f3ecbe_d59e7a6d01dc452586d11840ef14b719.pdf
    • https://static.usrfiles.com/ugd/c2007e_518d82c669bd4588abea95374bad4ee0.pdf
    • https://static.usrfiles.com/ugd/911c12_e8ce103b39fa42be9f00ed58e2241737.pdf
    • https://static.usrfiles.com/ugd/bfbc46_f2418cb71cb74fc58250391bc5ea2d9d.pdf
    • https://static.usrfiles.com/ugd/338562_a623cbb0d3a44f4b97825abdcb7c005c.pdf
    • https://static.usrfiles.com/ugd/3b47cb_e40c2c37f69a4f7a9fd3563ac19db98b.pdf
    • https://static.usrfiles.com/ugd/06497e_1af7c7e2f1b840f58338289fb7c0e694.pdf
    • https://static.usrfiles.com/ugd/0df15e_f18cbedbfb3a4abda785c9a27b460de2.pdf
    • https://static.usrfiles.com/ugd/55cc32_488a4ba0328141deaf46a5020bf60901.pdf
    • https://cdn.shopify.com/s/files/1/0462/5383/4394/files/tomameluvofovanidodaginer.pdf
    • https://cdn.shopify.com/s/files/1/0432/1063/7476/files/59623432775.pdf
    • https://cdn.shopify.com/s/files/1/0434/4243/8310/files/dipilimina.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/student_attendance_system_by_barcode_scan.pdf
    • https://cdn.shopify.com/s/files/1/0428/5494/0828/files/buwujeximamed.pdf
    • https://cdn.shopify.com/s/files/1/0429/0985/9999/files/important_current_affairs_of_august_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/2991/4012/files/adverbs_of_frequency_exercises_elementary.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068b5.bin
57a1068f7153e1db7f0ffcc9cc731852fd3643e49280ef3038c5f5896aac435b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B5 5092 bytes
font_01_sfnt_off000079ea.bin
185873f764b8a6cc75c3d19a60ed9207619b7acafd79e64f12ea0342d647040d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79EA 9740 bytes

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