Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe51ef6a9fe516a…

MALICIOUS

PDF

42.1 KB Created: 2020-08-07 02:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a90ff29a40b76e4d3edeb15f58961c6 SHA-1: d6cf1d45514d82792f56f083196b16e1c06d134c SHA-256: 5fe51ef6a9fe516a4f6c44fe167ff60a9867d75df31220aac7fc1227bbf17359
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious, reinforcing the assessment that the embedded links are intended to lead users to harmful sites.

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=astigmatismo+miopico+compuesto+pdf
    • http://files.satelliteaerialsystems.co.uk/uploads/1/3/0/8/130873822/e60c40572a752f3.pdf
    • http://mufiw.littlechristianpreschool.org/uploads/1/3/1/4/131453060/16f26fc48.pdf
    • http://files.primrosehillpto.org/uploads/1/3/2/6/132696077/jidutapat-kemenefewekivo.pdf
    • http://files.sorgsportandwellness.com/uploads/1/3/1/3/131379789/rokakinetudirati.pdf
    • http://files.albertoniego.com/uploads/1/3/1/8/131871644/rapebewesovupo-bedadu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5636/4709/files/83490725011.pdf
    • https://cdn.shopify.com/s/files/1/0440/0467/1646/files/digital_electronics_logic_gates.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5671/files/weekly_hourly_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/61548333966.pdf
    • https://cdn.shopify.com/s/files/1/0440/6345/7432/files/32085860331.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/20890239190.pdf
    • https://cdn.shopify.com/s/files/1/0429/9243/5359/files/zoregogubebolegawimon.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/vipulumibakatij.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/gurudowodejelumas.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/midumelumatate.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/49776474997.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_off000061aa.bin
18406be63fcb730c20287995ba7e17b3aca95ffc6b9a28eec0052a2cb2a68dd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61AA 5336 bytes
font_01_sfnt_off000073ca.bin
7a73989487e48ea9621425f31f5aee8f54300508810d31fc6ecd29df381073f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CA 11852 bytes

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