Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6acd611f1a81f46…

MALICIOUS

PDF

59.5 KB Created: 2020-07-08 13:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: f54c1004ec842465e983ac0d29aa47b9 SHA-1: a6693c0e08f48e0c3b196019c51deaf9ba9dd368 SHA-256: b6acd611f1a81f4685ab89445b69a153535c5acec13d849e1db0bc9a1b44ed1b
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though partially garbled, includes the title 'Ensayo sobre la violencia en mexico pdf' and the malicious URL, suggesting a lure to external malicious content.

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=ensayo%20sobre%20la%20violencia%20en%20mexico%20pdf In PDF document text
    • http://files.wakefieldmahon.com/uploads/1/3/0/9/130969242/2883507.pdfIn PDF document text
    • http://files.omanroadshow.com/uploads/1/3/0/7/130776841/kasulojemuv.pdfIn PDF document text
    • http://files.jlwarfield.com/uploads/1/3/2/6/132683088/nirelepepagevip_zobudokodubedez_mavagigik.pdfIn PDF document text
    • http://files.killjoy.info/uploads/1/3/2/8/132816158/444fa6d86d0810f.pdfIn PDF document text
    • http://files.savebozeman.org/uploads/1/3/1/4/131408529/80336d.pdfIn PDF document text
    • http://files.unnatinarang.com/uploads/1/3/2/7/132712514/lematudu.pdfIn PDF document text
    • http://files.bikeebike.com/uploads/1/3/1/3/131384101/223556ddbaf6d4a.pdfIn PDF document text
    • http://files.deweyfleszar.com/uploads/1/3/2/8/132815752/xerexamezeba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lidugimu.files.wordpress.com/2020/06/27432110143.pdfIn PDF document text
    • https://pofiled.files.wordpress.com/2020/07/nukofokilarajita.pdfIn PDF document text
    • https://xipiguver842418470.files.wordpress.com/2020/06/xiruzuzuxaxe.pdfIn PDF document text
    • https://kadipuxosika.files.wordpress.com/2020/06/83478799892.pdfIn PDF document text
    • https://wigovetomat571640416.files.wordpress.com/2020/07/71914994749.pdfIn PDF document text
    • https://nikisokosulo.files.wordpress.com/2020/07/72183619311.pdfIn PDF document text
    • https://geluxomu.files.wordpress.com/2020/06/80215801636.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_off0000ab32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB32 5336 bytes
SHA-256: f5b34409966c1e73cfd92e4daff9381a6121ba23b45b256d8ed825d5b086d558
font_01_sfnt_off0000bd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3B 10536 bytes
SHA-256: 2633a92451a86c577e9b91b7b633190e542a5df3bb88bb76745b324786adcd14

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