Malicious PDF — malware analysis report

Static analysis result for SHA-256 029d16ebfcaa3e57…

MALICIOUS

PDF

119.2 KB Created: 2020-08-04 01:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 904bf76150cf8da84f79eb3fdf8bd793 SHA-1: 2bb47d1a199f1c37160764775a1463562f7dfa57 SHA-256: 029d16ebfcaa3e579b76e2d70a411e997fcf5f07eb7a7217ea8d5678d3d3ad01
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a link farm designed to improve search engine rankings, and one critical link redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicates maliciousness.

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=local+anaesthesia+in+dentistry+pdf+download
    • http://files.yourlocalartists.com/uploads/1/3/1/0/131070105/4357853.pdf
    • http://files.ncdkg.org/uploads/1/3/0/7/130776578/pasemexabinutis-pojit-zogewe-misowepilev.pdf
    • http://files.waialamocity.org/uploads/1/3/1/8/131871424/jukudavogi.pdf
    • http://files.cvalc.org/uploads/1/3/2/6/132695568/zefikexivulo.pdf
    • http://files.best-window-tinting-in-miami.com/uploads/1/3/0/8/130815009/feada.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/wimubegevunabenudubukimi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4355/1392/files/kajejiliso.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39858795743.pdf
    • https://cdn.shopify.com/s/files/1/0432/5235/1144/files/72243419461.pdf
    • https://cdn.shopify.com/s/files/1/0439/2235/8427/files/78281639534.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0941/files/47046682494.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58933331969.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9009713252.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/24867760736.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/kurodudezuwimodofevewo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1188956193.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_off000184de.bin
b740fb5772f30033a20b64cac589e5f3d4272b57f5e72ea652a39b6fd94a8056		 pdf-font-stream PDF embedded font (sfnt) at offset 0x184DE 1644 bytes
font_01_sfnt_off00018d14.bin
a059f0ff1ceb82dc0fd2c51118e23b42c3032a5b45d53868a8ca05620ead9006		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D14 5376 bytes
font_02_sfnt_off00019f75.bin
27590f8c4d55d463c7f4726c1883ee87d6ca9256b1d76217f31205f3044fae9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19F75 15368 bytes

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