Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0c515e4e753364…

MALICIOUS

PDF

56.6 KB Created: 2020-07-08 11:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 690130b3c8e520c035a1a510355f8d61 SHA-1: af15993b474d8c07380140cb6f85490c8a1fc176 SHA-256: 2f0c515e4e753364af738585d98b6156df8ed71994173362e213da3e0c01a97e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One prominent link, 'https://ttraff.ru/wb?keyword=human%20physiology%208th%20edition%20silverthorn%20pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to trick users into clicking through to potentially harmful sites.

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=human%20physiology%208th%20edition%20silverthorn%20pdf In PDF document text
    • http://files.toadsoftowedhaul.com/uploads/1/3/2/8/132815752/2564212.pdfIn PDF document text
    • http://files.joseluisperezjim.com/uploads/1/3/1/3/131383553/gejuxab.pdfIn PDF document text
    • http://files.markheggaircraft.com/uploads/1/3/1/3/131380998/13fbc841a385.pdfIn PDF document text
    • http://files.flindersroom4u.com/uploads/1/3/1/8/131857071/37bce30db9.pdfIn PDF document text
    • http://files.allfloorsinteriors.com/uploads/1/3/0/9/130969375/kexajize.pdfIn PDF document text
    • http://files.womenartistsreaction.com/uploads/1/3/2/3/132302863/8d22be5d98d153.pdfIn PDF document text
    • http://files.monfortestatesdacula.com/uploads/1/3/2/6/132681002/226bb98.pdfIn PDF document text
    • http://files.conventionandeventstaff.com/uploads/1/3/0/8/130814868/552ad9b91e.pdfIn PDF document text
    • http://files.newhorizonsblingparadise.com/uploads/1/3/1/3/131381722/030a7.pdfIn PDF document text
    • http://files.singersandactorsworkshop.com/uploads/1/3/2/7/132740218/mubazaxumadajag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wejaxan901614801.files.wordpress.com/2020/07/susovevusisujanidipub.pdfIn PDF document text
    • https://gipiwes.files.wordpress.com/2020/06/pewavujejuzifa.pdfIn PDF document text
    • https://xebekuno.files.wordpress.com/2020/06/30281687799.pdfIn PDF document text
    • https://zitojagujot606021839.files.wordpress.com/2020/07/12023691821.pdfIn PDF document text
    • https://fikuravere.files.wordpress.com/2020/06/lokozak.pdfIn PDF document text
    • https://jezodewetas.files.wordpress.com/2020/06/60811643963.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_off00009ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DED 5656 bytes
SHA-256: 5154b4d671e641bf7dafd2f10912b117aaa28f2d635032a7bb2f49514e7f97f1
font_01_sfnt_off0000b0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F6 10920 bytes
SHA-256: e7835da608a43edbe1a53d4b77cd17796e78f666e7fd2e052a71fe8b539da1d0

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