Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d0a1db4f139c075…

MALICIOUS

PDF

52.0 KB Created: 2020-08-19 05:40:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2b91f1748c41fa6c2b34f4a980faaf0f SHA-1: f6d10d71b2e758647acf71f6e2ba210313b8b1e0 SHA-256: 3d0a1db4f139c075b2155160ffda840d17519587150a9dd51ecbd35d31617463
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the links, https://ttraff.cc/pify?keyword=keratina+sin+formol, is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links suggests a link farm or a phishing attempt designed to lead users to malicious content.

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=keratina+sin+formol In PDF document text
    • http://files.clearwatermusicserves.com/uploads/1/3/0/7/130738859/sujazefutog-fowamuzibefazop-medutu-sujudavagevakax.pdfIn PDF document text
    • http://lefaru.orangecaddy.com/uploads/1/3/2/8/132814742/5993488.pdfIn PDF document text
    • http://vuletasa.kountryacresfrenchies.com/uploads/1/3/0/8/130874642/4404302.pdfIn PDF document text
    • http://files.edinburghacupuncture.com/uploads/1/3/0/8/130814529/tanusavovog-maromojeneximo-duxafigezomu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/0701/1998/files/yume_miru_kusuri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66264102559.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97285982277.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9966/1223/files/38026334367.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2821/0086/files/hexagon_explosion_box_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nijudesiko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3957/1616/files/72258284719.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3735/9271/files/ser_bachiller_preguntas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8529/9874/files/6360982188.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D73 4884 bytes
SHA-256: 1bfd5ef674005f3d017e723418023a3e8f4641158800d848ae8b337c240cbab8
font_01_sfnt_off00009df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DF7 11092 bytes
SHA-256: 666172e384a54693c27e9a68e7a6f6c1f6aff0beb649cb131d94db78431e96c1

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