Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c91ce6515b8fa84…

MALICIOUS

PDF

33.1 KB Created: 2020-07-09 04:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: abac8de4379ddcd074804547b9ed764d SHA-1: 3615ca4097f4355e2879766cb6b75c719a5a6b63 SHA-256: 9c91ce6515b8fa843fc13e44a8bd097ed5f183c7e689ccb0cc46a8200a9b725f
184 Risk Score

Malware Insights

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

The PDF document is designed as a lure, masquerading as a manual for a 'Mini bluetooth speaker sk-s10'. It contains a significant number of embedded links pointing to external PDF files hosted on various domains, indicating a link farm or redirector strategy. One of the primary links directs to a known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.ru/wb?keyword=mini%20bluetooth%20speaker%20sk-s10%20manual In PDF document text
    • http://files.vellichorshop.com/uploads/1/3/0/7/130740090/xilusonuxaf-filuzavulat.pdfIn PDF document text
    • http://files.mcnaacp6304.org/uploads/1/3/1/4/131453248/wiveduno_rejusanuxumaje.pdfIn PDF document text
    • http://files.haciendasonoma.com/uploads/1/3/2/7/132740218/7130198.pdfIn PDF document text
    • http://files.abundantbehavioralhealth.net/uploads/1/3/1/4/131408344/jikaputofexona_tobixod_zixibewole_pelisam.pdfIn PDF document text
    • http://files.wtfmir.shop/uploads/1/3/1/6/131637092/genodi_jelas.pdfIn PDF document text
    • http://files.authorkimfox.com/uploads/1/3/1/3/131379612/kemunafejebos_furugamoros_vagububike_wivosoruda.pdfIn PDF document text
    • http://files.genesisradio.net/uploads/1/3/0/8/130874142/48c39501bc7d.pdfIn PDF document text
    • http://files.nprents.com/uploads/1/3/0/9/130969775/982fe6.pdfIn PDF document text
    • http://files.thecuriouscatgiftshop.com/uploads/1/3/2/6/132681596/puwakir.pdfIn PDF document text
    • http://files.shepherdsrodaudio.com/uploads/1/3/1/4/131437161/e34121514c1a748.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sixupijemiw.files.wordpress.com/2020/07/fizarevoxekuvopisu.pdfIn PDF document text
    • https://nolifajidame.files.wordpress.com/2020/07/keganilofixinatilifadok.pdfIn PDF document text
    • https://xoxojoxus.files.wordpress.com/2020/06/47481431160.pdfIn PDF document text
    • https://tozoxoxejon.files.wordpress.com/2020/07/watiruzutukofe.pdfIn PDF document text
    • https://nobijip.files.wordpress.com/2020/06/93928077846.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nubizasijimowedemo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefiwi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47E8 5376 bytes
SHA-256: 2f21883ef967f7a3d30650076b933ba3dba6b2cee05f605b10f1f7ae0624afaa
font_01_sfnt_off00005a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A03 8716 bytes
SHA-256: 3d75037ef172d9cf211a3ca304aca92c550f64e90fe3b1cca8dd790ce43448e8

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