Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fb740c754b05dd…

MALICIOUS

PDF

47.1 KB Created: 2020-09-11 21:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c681ba22b86434ecf45376067fca7f9b SHA-1: d55db893010aae4e689e0884333554410ac8170e SHA-256: c4fb740c754b05dd7ad55bc2e72f7537b0a34004a065f07b9c761820d6c7a250
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a deceptive title and a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users to potentially malicious websites through a link farm disguised as a template.

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.me/wix?keyword=house+guidebook+template
    • http://files.infolibrarian.net/uploads/1/3/2/3/132302716/gilimitevavivusu.pdf
    • http://zeravor.danielsiegelproductions.com/uploads/1/3/1/4/131453336/1e285.pdf
    • http://files.mindfulnessnow.co.uk/uploads/1/3/0/7/130775592/daa5966a69.pdf
    • http://zonate.josegagonzalez.com/uploads/1/3/1/0/131070420/f3a08.pdf
    • http://files.eleven22inc.com/uploads/1/3/1/4/131437064/8279717.pdf
    • http://bekez.ottawavalleygrainstore.ca/uploads/1/3/0/8/130813694/gavodo_negiwadib_pizaturovav_gatoxiponeg.pdf
    • http://mozen.lovelovemedodesigns.com/uploads/1/3/1/8/131856278/31406b4a477b81.pdf
    • http://files.natalieariannebaack.com/uploads/1/3/1/4/131407406/5f82d13aefd6bf.pdf
    • https://cdn.shopify.com/s/files/1/0440/5959/0806/files/59639965544.pdf
    • https://cdn.shopify.com/s/files/1/0428/4357/0343/files/jenaliteronevu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9839/1196/files/nogudelorepaxawagenavovu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/pre_algebra_tests.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0210/files/15786030113.pdf
    • https://static.usrfiles.com/ugd/405339_a364b6ed5fc643518922b8bac30462a4.pdf
    • https://static.usrfiles.com/ugd/80c1db_55a1e9c56aaf4eacb529528c707954be.pdf
    • https://static.usrfiles.com/ugd/5926b4_20b22ab18a5c46dfb63604d28b41a46d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c1a.bin
6363139648c6c1227fe05392820e54e9e54a49c43f41b9e21f7476b0cf65ef83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C1A 5124 bytes
font_01_sfnt_off00007d8c.bin
4aac8beb63f264a38d10f84625676cdb0abd911f01be8a01c69fa711f63421c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8C 10504 bytes
font_02_sfnt_off0000a175.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA175 4324 bytes

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