Malicious PDF — malware analysis report

Static analysis result for SHA-256 23eb6db9c451db0e…

MALICIOUS

PDF

41.4 KB Created: 2020-08-03 06:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26189a4751f09c3887f9c200620b85b2 SHA-1: 0ebb7a31827e7d2443ecbb911b8229e523b4fb1a SHA-256: 23eb6db9c451db0e7fbf31b655295c43261eceaedee6aa291213819e86f1af30
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=slippin+dmx+lyrics', points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and references to other PDF files hosted on various domains. This suggests the primary purpose is to direct users to malicious infrastructure or to manipulate search engine results.

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.ru/pify?keyword=slippin+dmx+lyrics
    • http://files.antioch-jubilee.net/uploads/1/3/1/6/131606368/nukofuvi_rawedazaf_pewewomipi.pdf
    • http://files.flash4five.com/uploads/1/3/2/7/132741430/wuxiti_nosuwibif_tejasofegaleki.pdf
    • http://files.meditationgiftshop.com/uploads/1/3/0/9/130969176/sozurutixuvepilu.pdf
    • http://files.holidayhousesrarotonga.com/uploads/1/3/0/7/130739754/41e2079a22c2.pdf
    • http://files.bombni.com/uploads/1/3/0/7/130740586/lipakarasafemaru.pdf
    • https://cdn.shopify.com/s/files/1/0431/8740/4968/files/nabazowuk.pdf
    • https://cdn.shopify.com/s/files/1/0440/4638/5317/files/64453085397.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/68162605730.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/24183366497.pdf
    • https://cdn.shopify.com/s/files/1/0429/4619/9711/files/drivers_manual_ny.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/18131870471.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0816/files/phoneclaim_sprint_uploader.pdf
    • https://cdn.shopify.com/s/files/1/0432/5123/7022/files/pipisefotodafelajimob.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5499/files/26523506452.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4695/files/garmin_430_simulator.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/61576206487.pdf
    • https://cdn.shopify.com/s/files/1/0433/9931/5619/files/65593219549.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_off000064e4.bin
07f57f428d13a491f1d45f2d5d2162b28eca10d9b75a0fc3e26872061490d4ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E4 5280 bytes
font_01_sfnt_off000076d1.bin
bada9f5196bb4126e1814d644d7e3e12bb72807556dfeefbb66a829761cf6d19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D1 9888 bytes

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