Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf92cf1378ad891…

MALICIOUS

PDF

46.0 KB Created: 2020-08-13 01:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 996ecbe01f997c24e0d09289b9408754 SHA-1: efed0b4c2838615c5e58e96aaa5a17676f2b9e1a SHA-256: 6cf92cf1378ad8912095d31e5af455f39a82f55137ac73c6fb81442928d84e2e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure, and the ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious infrastructure.

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=calcium+chloride+msds+sigma+pdf
    • http://files.marymaceybutler.com/uploads/1/3/0/7/130738569/zejugariluvex-bujos-xijafinulokoxis-sigufopibafosef.pdf
    • http://tavup.cabinzecottage.com/uploads/1/3/0/8/130814535/4931222.pdf
    • http://files.jordanbc.org/uploads/1/3/0/7/130739614/64cdc340d7.pdf
    • http://kixolilu.pointclearcattery.com/uploads/1/3/1/3/131384481/83ba3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/77799524167.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/nebomegolozasedafararo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0163/4201/files/9935353911.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2960/files/92417805107.pdf
    • https://cdn.shopify.com/s/files/1/0431/5067/2026/files/bumoworaziropomivaro.pdf
    • https://cdn.shopify.com/s/files/1/0432/6627/7534/files/22853105065.pdf
    • https://cdn.shopify.com/s/files/1/0428/8721/7311/files/nonutapurifoforizutijimo.pdf
    • https://cdn.shopify.com/s/files/1/0438/8628/0872/files/supodojoxekudalekamej.pdf
    • https://cdn.shopify.com/s/files/1/0436/0437/7763/files/61675986861.pdf
    • https://cdn.shopify.com/s/files/1/0432/7401/0782/files/warranty_card.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/study_arabic_language.pdf
    • https://cdn.shopify.com/s/files/1/0435/3287/7976/files/arabian_nights_piano.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/36193720556.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9115/files/58456277199.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000684c.bin
982f1b255b2a14f1f7699303efc44b3eb6d0e0f019bfb8a83f5e3128a0e2def0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x684C 5288 bytes
font_01_sfnt_off00007a45.bin
0c7bbd75e17d1ce2adf4e21afb8d259e1ce4d7701244519420f58e611e62b620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A45 10060 bytes
font_02_sfnt_off00009ca7.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CA7 4324 bytes

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