Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58acb4f450e8eb5…

MALICIOUS

PDF

52.4 KB Created: 2020-07-31 07:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07c2a83c5a8e4c8e264b832afaad5c27 SHA-1: ddcd3b996cc90e2fadde9a65f9db9c2bc2227952 SHA-256: d58acb4f450e8eb57da0b8dc63b2c816c465f6adce202ed13360e832746b4ac4
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it features a PDF link farm heuristic, indicating a large number of outbound links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The embedded content, though heavily obfuscated, appears to be a lure related to a 'Carolina diner menu pdf'. The primary attack vector is likely a user clicking the malicious link within the PDF, leading to a compromised site.

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=carolina+diner+menu+pdf
    • http://files.magistrasolomon.org/uploads/1/3/0/7/130739443/buropamamujopa.pdf
    • http://files.springdalesva.com/uploads/1/3/0/7/130776326/1059353.pdf
    • http://files.rhythmresearchresources.net/uploads/1/3/1/6/131606127/gelizoxi-mevep-xuzumifam.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5901/files/wikujoxafodabagajewe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8225/2442/files/zugisugexagawewufo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5885/files/vililaxon.pdf
    • https://cdn.shopify.com/s/files/1/0439/2756/8552/files/54584911117.pdf
    • https://cdn.shopify.com/s/files/1/0431/9074/7295/files/28592758163.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/nawetemezavo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8733/1481/files/gaxuvef.pdf
    • https://cdn.shopify.com/s/files/1/0435/8737/1167/files/nukimepuzalozirokasebinem.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/kogixemidekezexosamajabu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1995/0485/files/wukomugajuneb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/babasetaxoguvivowe.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/16916532653.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/
    • https://cdn.shopify.com/s/files/1/0439/2756/8552/files/54584911117

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b3d.bin
b2a2e9f6973423dae091349aa90628b12c6b7eeeb965e36f84de87eb407167aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3D 4832 bytes
font_01_sfnt_off00008b8a.bin
464bb085d15e258b559a1a4517fe80fd96a979ec060c75fe6cca11a2477f761b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B8A 10220 bytes
font_02_sfnt_off0000aeae.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAE 16312 bytes

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