Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0eb76de11a9bc2…

MALICIOUS

PDF

46.0 KB Created: 2020-07-21 07:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58c6a6dc38f2693404dc03e4c4b41388 SHA-1: a1592c45cc2fbd9368763f0e56886a303d783418 SHA-256: 6f0eb76de11a9bc26288e6f9403fa208ab27f983c933131b4b77dd4275dfbb26
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an intent to lead users to harmful sites. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the link farm and redirector heuristic point to a malicious distribution or SEO manipulation scheme.

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=pokemon%20trading%20card%20game%20rules%20pdf
    • http://files.swhtambulance.org/uploads/1/3/1/1/131164027/1815527.pdf
    • http://files.lumenctr.org/uploads/1/3/1/8/131871796/vatebobunaxu-sikuzoxupe-xebenujin-neruzomusame.pdf
    • http://files.creativesheetmetalworks.com/uploads/1/3/2/8/132814980/58ab018c0a3dd.pdf
    • http://files.opossumbottom.com/uploads/1/3/0/7/130739490/189c5420062.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8771/5742/files/tenagaxoziv.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7875/files/73028940358.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7511/files/38406499995.pdf
    • https://nariwep.files.wordpress.com/2020/07/kigoveduxetetigupe.pdf
    • https://xevadev.files.wordpress.com/2020/07/dopunatosofuzokux.pdf
    • https://dipirikufuda.files.wordpress.com/2020/06/75175919612.pdf
    • https://jekiwex.files.wordpress.com/2020/07/58581885430.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48177964882.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/17675312916.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vazakiliduvapi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0494/files/38326023916.pdf
    • https://cdn.shopify.com/s/files/1/0431/4696/9237/files/tebumitukut.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9768/files/86890392804.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/35941514430.pdf
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/66320001978.pdf
    • https://cdn.shopify.com/s/files/1/0431/2042/7157/files/sigikejimarabi.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_off0000762e.bin
321e7866668ccd5057ced6d7062673503b9f73bc0d84374710ad6a340e54d4e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762E 5424 bytes
font_01_sfnt_off00008887.bin
479e8b89482281b481ef0bae4d1e859a75b3a5442eae74509fab9001346c0536		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8887 9872 bytes

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