Malicious PDF — malware analysis report

Static analysis result for SHA-256 73dc26db33defa76…

MALICIOUS

PDF

44.4 KB Created: 2020-08-24 17:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86d5d3e94354aa38b6dca5e80525e264 SHA-1: ed02775d3ebab7350eaf1a482725fadf24dc3691 SHA-256: 73dc26db33defa76acccf96081fb2ef1e282413f54193f4e6cfa66028786c37a
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One prominent link directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the text 'Monarch butterfly facts and information' and the malicious redirector URL, suggesting a lure to trick users into visiting potentially harmful sites. No scripts were extracted, but the heuristic firings strongly indicate malicious intent through link manipulation.

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/pify?keyword=monarch+butterfly+facts+and+information
    • http://vedipatuv.sscsno.org/uploads/1/3/2/6/132682076/resasib-fogakovakesoni.pdf
    • http://sinagasub.communitycreditinc.com/uploads/1/3/1/6/131606490/jepuxisemupenerupu.pdf
    • http://files.yukimuli.com/uploads/1/3/2/6/132695828/a706cd.pdf
    • http://files.crowhollowcrafts.com/uploads/1/3/1/8/131857914/tanida.pdf
    • http://dotodum.britemoonmarketing.com/uploads/1/3/1/3/131379598/982a65e742.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6559/8364/files/kusepujora.pdf
    • https://cdn.shopify.com/s/files/1/0432/9730/8840/files/22222514580.pdf
    • https://cdn.shopify.com/s/files/1/0430/8280/9508/files/zobifunatuxoburonerik.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/61609698330.pdf
    • https://cdn.shopify.com/s/files/1/0434/0177/3212/files/79300378472.pdf
    • https://cdn.shopify.com/s/files/1/0435/5470/1463/files/xexevofilu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2585/6662/files/information_about_gst.pdf
    • https://cdn.shopify.com/s/files/1/0433/9345/0134/files/islamic_calendar_2020_pakistan.pdf
    • https://cdn.shopify.com/s/files/1/0430/0229/8521/files/lidetoguvebemekijowakox.pdf
    • https://cdn.shopify.com/s/files/1/0437/3823/5031/files/nunizudubon.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f35.bin
0a688b6b7cb98e21dc5427e9b5e1e00ecd3a0eab03d27ce69d65d3e472092812		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F35 5508 bytes
font_01_sfnt_off000081ca.bin
07ab2c11e254c16532e48a194619a36a6d83e611e5fe73cc71e449691a6aba16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81CA 10288 bytes

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