Malicious PDF — malware analysis report

Static analysis result for SHA-256 9191faab98e5735b…

MALICIOUS

PDF

36.4 KB Created: 2020-08-10 00:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11ad12c79f930c4f04c71f9cf2880753 SHA-1: 4c6a70d54fdcb7e5c2a1d9c594b3d232070ccd9a SHA-256: 9191faab98e5735bfa98ac82915b2f8abdfa2ffe88ad0ee072470f050824a06c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high number of external links, with one specifically identified as a malicious redirector. The document body, though obfuscated, contains the URL 'https://ttraff.com/pify?keyword=district+capacity+assessment+pdf', suggesting a lure to a malicious site. The ML classifier strongly supports the malicious verdict.

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=district+capacity+assessment+pdf
    • http://files.artoflamb.net/uploads/1/3/1/3/131398461/kulivunu.pdf
    • http://xedofila.applause-tickets.com/uploads/1/3/1/6/131606186/jodazavosajadoluwor.pdf
    • http://suwaz.pit-p.com/uploads/1/3/1/6/131636725/3a30340cec8da10.pdf
    • http://files.greenbuffaloestates.com/uploads/1/3/0/9/130969327/tomefat.pdf
    • http://xilafola.roamingbuffalo.us/uploads/1/3/1/0/131069934/1d3e5ae5cb5619d.pdf
    • https://cdn.shopify.com/s/files/1/0445/5625/5396/files/36223307321.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/28068876324.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/52543866305.pdf
    • https://cdn.shopify.com/s/files/1/0431/0253/5840/files/5629730571.pdf
    • https://cdn.shopify.com/s/files/1/0450/7369/4870/files/mathematical_thinking_problem_solving_and_proofs.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/kujuxumug.pdf
    • https://cdn.shopify.com/s/files/1/0441/3059/9064/files/nissan_maxima_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/6869/3407/files/5553186050.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/export_html_to_angular.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99289858455.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9942/files/nonowipalajube.pdf
    • https://cdn.shopify.com/s/files/1/0433/0412/4571/files/79747605391.pdf
    • https://cdn.shopify.com/s/files/1/0433/1018/6654/files/ribebajozonezosuwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/desirufotuvu.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_off00004f30.bin
a976f54091a8713b7db443cd71406a2fa466c94ee946a3c143f542aff195f675		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F30 5368 bytes
font_01_sfnt_off0000616f.bin
eae44be7db2f99a6d22a854980b82b7733f2f4a687dea3a7d4dc23351054ab67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616F 10364 bytes

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