Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71e13e42eed21bf…

MALICIOUS

PDF

45.4 KB Created: 2020-08-06 13:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 260d2ff9cff58a61508383eeeec98fc9 SHA-1: 2ba542c30ba2ffb5aeb0b79f603398b445c71fb0 SHA-256: e71e13e42eed21bfe13a9ed01bc6811b563be21d38f6b765b6d5c9d346713f07
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic firing for a malicious redirector link. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL and other links, suggesting a lure to external content. The primary attack pattern appears to be a link farm designed to redirect users to malicious sites, potentially for SEO manipulation or phishing.

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.cc/wb?keyword=nb-iot%203gpp%20release%2013%20pdf
    • http://files.zacksguttering.com.au/uploads/1/3/2/6/132696604/xoluxadako.pdf
    • http://files.solutionsgurullc.com/uploads/1/3/2/6/132681409/9566294.pdf
    • http://files.pocketfulproductions.com/uploads/1/3/2/6/132682040/1257197.pdf
    • http://files.adventurebikecomponents.com.au/uploads/1/3/1/4/131453464/nezurame_faxarej.pdf
    • http://files.kalaikoodam.org/uploads/1/3/1/4/131437491/kemoda.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/83752020140.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vasopamomakazemujavinis.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/sidima.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/fapavajazupobaliwir.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/nukubafufetopufigosaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/community_bundles_stardew_valley.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/gofofadamekaro.pdf
    • https://cdn.shopify.com/s/files/1/0440/4061/8134/files/xixevaguvewuvugexafitawo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6306/files/7051999325.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/66262655251.pdf
    • https://cdn.shopify.com/s/files/1/0437/2535/7210/files/90464681425.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/giwide.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_off00006c04.bin
cc93afeeb2a1d3e743fa320d2166c42048bd71c1e3c010eb3906522ca1bbe84c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C04 5568 bytes
font_01_sfnt_off00007f0c.bin
47f44b51050e845caf50c192b7cd369bc08a82474320999edfbf57102f255777		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0C 13460 bytes

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