Malicious PDF — malware analysis report

Static analysis result for SHA-256 87910ea94b05c8cc…

MALICIOUS

PDF

39.4 KB Created: 2020-07-09 10:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbe17edf301adea16a8afb171f2cfec9 SHA-1: 3a9ceb096c510591e522a5a10226133f17e0bfe2 SHA-256: 87910ea94b05c8cca952ac87025860233b010b2bab4ae5ef9ae80fec60e85422
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document exhibits characteristics of a link farm, embedding a large number of URLs that point to various file-sharing or content-hosting domains. One critical heuristic identified a direct link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness. The document body contains garbled text alongside the URLs, suggesting it's primarily a vehicle for distributing these links rather than conveying legitimate information.

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.com/pify?keyword=brevet+physique+chimie+2019+pdf
    • http://files.shannondrhodes.com/uploads/1/3/0/8/130873907/1944747.pdf
    • http://files.animationstationpodcast.com/uploads/1/3/1/1/131163563/4487555.pdf
    • http://files.johnromeromusic.com/uploads/1/3/0/9/130969046/kuroduperimora-birorurofawafa-pujukudo-xinevedawajim.pdf
    • http://files.rathfrilandmotorclub.co.uk/uploads/1/3/2/3/132302913/zomawuzivoludi_petusol_mufawukemur_xitedelufukojob.pdf
    • http://files.lincolnfencecontractors.com/uploads/1/3/2/6/132681938/7c5f525598fb.pdf
    • http://files.aldersongallery.com/uploads/1/3/2/6/132681970/wewaruxop_dadimoti_rufugirodoju_jexodejilojam.pdf
    • http://files.nickynoodlesdoodles.co.uk/uploads/1/3/2/6/132680915/joboxugo-lesofijirilet-zupawirepevis.pdf
    • http://files.backwind.ca/uploads/1/3/0/7/130739251/4621837.pdf
    • http://files.foodloveblog.com/uploads/1/3/1/3/131380868/vosirijofa.pdf
    • http://files.mountaineerthon.com/uploads/1/3/1/3/131384145/dagune.pdf
    • http://files.alicepyho.com/uploads/1/3/1/8/131856071/a7b3e73461d007.pdf
    • http://files.genefambrough.com/uploads/1/3/1/3/131398529/607645.pdf
    • https://lugolasef.files.wordpress.com/2020/06/23607850276.pdf
    • https://jimetita.files.wordpress.com/2020/06/7157332517.pdf
    • https://pobiwinut.files.wordpress.com/2020/06/kenupowebexu.pdf
    • https://wuxafojibom.files.wordpress.com/2020/06/63506167724.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67279733654.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jikoleluvotejagumali.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/suxuteregejo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31492874922.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/norojakibi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6733015585.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bibekejufalakudogaloseja.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a9d.bin
7d04b8a2bf44eff92bc85746d9ee00fb938fc1c57ddf809da1fea37c6d47e5d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9D 5640 bytes
font_01_sfnt_off00006deb.bin
f06852799d7388729159083da436eb93e1612dd06329f1d197def09299ba0c2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEB 10136 bytes

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