Malicious PDF — malware analysis report

Static analysis result for SHA-256 06fea4e4f3d95001…

MALICIOUS

PDF

50.5 KB Created: 2020-08-26 05:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c28d58debf36ea5658acc93133797a27 SHA-1: 034d0561c366cd7bee2f73f26f366d24240ddb1a SHA-256: 06fea4e4f3d950016f9edefb2c4806f70f152e0a2fe19bc655c783251857e66b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of embedded links, many of which point to potentially malicious redirector infrastructure. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic, likely leading to further malicious content or exploits.

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.link/pify?keyword=calculus+examples+and+solutions
    • http://zizugibur.danielmachine.store/uploads/1/3/1/4/131452977/4827682.pdf
    • http://files.omnibus-climb4charity.org/uploads/1/3/1/3/131382274/riduwonake-marulogito.pdf
    • http://jidekowa.msutaekwondo.org/uploads/1/3/0/8/130814328/vajelatazup-kowidibubul.pdf
    • http://pixazozik.sonomasound.com/uploads/1/3/0/8/130873954/padajuzivugaral.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0957/1989/files/business_correspondence_report_writing_sharma.pdf
    • https://cdn.shopify.com/s/files/1/0431/6522/1028/files/66335778043.pdf
    • https://cdn.shopify.com/s/files/1/0464/2753/7560/files/zosemopafariduxibi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8118/files/defunemosebigep.pdf
    • https://cdn.shopify.com/s/files/1/0440/1197/8902/files/carnatic_music_theory_books_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0433/7270/7990/files/vikulojawawegada.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/grade_2_math_subtraction_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/0356/6486/files/27302747805.pdf
    • https://cdn.shopify.com/s/files/1/0430/6052/7253/files/38602268629.pdf
    • https://cdn.shopify.com/s/files/1/0430/7868/0727/files/javascript_get_window_width.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/9334902132.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_off00007b4b.bin
31f9c72c951beb2a9041ffd272f5a9f22290163777b2d530b096f76207ef1571		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4B 5096 bytes
font_01_sfnt_off00008c90.bin
fdf204773fafb9628b008778222a5d268957059ac24ce1ade3d84c4daeb10fa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C90 10292 bytes
font_02_sfnt_off0000aefa.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFA 4324 bytes

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