Malicious PDF — malware analysis report

Static analysis result for SHA-256 901b61f24cdc7f7a…

MALICIOUS

PDF

42.0 KB Created: 2020-09-01 16:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2991053e476a73b092de640643e73613 SHA-1: 8d67f9aadd63f0504aed59e985ed2af19838c3d0 SHA-256: 901b61f24cdc7f7a68c4b860cd38cdc79e80d9c0fa790a173d6a2397e0193152
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=anatomy+and+physiology+of+retina+pdf'. This URL is designed to lure users into clicking, likely leading to a malicious download or further compromise. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to static.usrfiles.com. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence of a phishing or redirection attack.

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=anatomy+and+physiology+of+retina+pdf
    • https://static.usrfiles.com/ugd/6290de_840d709e8a534fd79d85e8b612263881.pdf
    • https://static.usrfiles.com/ugd/b8c837_4abf592978054b1da6bc63980d4e3767.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e89944775ce4cac9cbbc9645d74763d.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/sadilebukoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/7969/5517/files/atualizar_whatsapp_2018_android.pdf
    • https://cdn.shopify.com/s/files/1/0436/2282/6142/files/basic_electronics_tutorial_point.pdf
    • https://cdn.shopify.com/s/files/1/0463/4152/1564/files/logo_quiz_answers_level_3_logo_28.pdf
    • https://static.usrfiles.com/ugd/f63f29_51763a5a94fe4d83b3909daaea4b453f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9431dcffb636424b802f7aac8940d8e2.pdf
    • https://static.usrfiles.com/ugd/cb5dea_a5d357e5a4474b58b0b1a2508ac4dd33.pdf
    • https://static.usrfiles.com/ugd/5a1791_b28330b638df40ae8dfda5d8701a15ef.pdf
    • https://cdn.shopify.com/s/files/1/0439/1793/4747/files/dakosekimil.pdf
    • https://cdn.shopify.com/s/files/1/0435/3179/6632/files/21489978016.pdf
    • https://cdn.shopify.com/s/files/1/0433/5416/1310/files/xiwumiwum.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_off000062fa.bin
1247dfc939b168be0a0d2dccfbfe840655ada4d9c9bdd39c8c9e63156ec9838b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FA 5544 bytes
font_01_sfnt_off000075bb.bin
cd76f00f9be5a3d6694b69f8cef4baeffe3edf74a57b684dc36d19073cb64825		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75BB 10560 bytes

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