Malicious PDF — malware analysis report

Static analysis result for SHA-256 4396c2f0436449ae…

MALICIOUS

PDF

44.3 KB Created: 2020-07-08 12:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: bc1bc4ff8fdd89202fcc5ed2380e2272 SHA-1: 340597c26bf46b8259dc573d2eede8e5fa23bd18 SHA-256: 4396c2f0436449ae739062578405321efb37402209cbeb805ea59253f2bc6d84
184 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate content, such as a study guide, to trick users into clicking malicious URLs. The primary malicious URL identified is https://ttraff.cc/wb?keyword=ets%20official%20guide%20to%20the%20gre%20pdf, which redirects to further malicious infrastructure. The document body and embedded URLs confirm the lure and the link farm strategy.

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.cc/wb?keyword=ets%20official%20guide%20to%20the%20gre%20pdf In PDF document text
    • http://files.tivertondramaticsociety.co.uk/uploads/1/3/2/6/132682681/4e01ed004a038.pdfIn PDF document text
    • http://files.biophysical-ecology.com/uploads/1/3/1/4/131406356/xivut_girusidusowele_finusagon.pdfIn PDF document text
    • http://files.lakefieldbaptistchurch.org/uploads/1/3/1/0/131070523/lugutogaponajebabu.pdfIn PDF document text
    • http://files.bellamedaesthetics.com/uploads/1/3/2/7/132712514/f98663.pdfIn PDF document text
    • http://files.thedinopark.com/uploads/1/3/2/7/132740415/6535022.pdfIn PDF document text
    • http://files.425sqn.org/uploads/1/3/0/8/130814642/zotazaboma.pdfIn PDF document text
    • http://files.chardehenderson.com/uploads/1/3/1/0/131070366/8792782.pdfIn PDF document text
    • http://files.kbcfishing.com/uploads/1/3/0/7/130776514/0af00ee117aa.pdfIn PDF document text
    • http://files.vivagreb.com/uploads/1/3/1/6/131637034/kimab-sugala.pdfIn PDF document text
    • http://files.csdola.org/uploads/1/3/1/8/131871648/3085cd9.pdfIn PDF document text
    • http://files.shearserenitysalon.com/uploads/1/3/1/3/131383553/53b9878d6b0f11.pdfIn PDF document text
    • http://files.kaloncounseling.com/uploads/1/3/1/8/131856518/kasajizevume.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xotokikip.files.wordpress.com/2020/06/nuguxakedozoguz.pdfIn PDF document text
    • https://zapoguwufar.files.wordpress.com/2020/06/xisil.pdfIn PDF document text
    • https://mopomuwoza.files.wordpress.com/2020/07/22011249920.pdfIn PDF document text
    • https://nubudin.files.wordpress.com/2020/07/99019044627.pdfIn PDF document text
    • https://datewaxota.files.wordpress.com/2020/06/53781230220.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_off00006f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F77 5152 bytes
SHA-256: 85612d947aae5610cbe8d9d17a27a7ed326e72848b4c97bc710222b5bb4b18ff
font_01_sfnt_off00008110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8110 10272 bytes
SHA-256: 1e5a812dde258cd866d4b87339ea498d837dac587ba39682825dbcf7e127b1d5

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