Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6c8e4e67d7ad48…

MALICIOUS

PDF

48.6 KB Created: 2020-07-09 09:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: abfb9eae2b5694e121db4995b7675b47 SHA-1: ffd451fd21cf917b1d10286b7fac61ed504573f5 SHA-256: 0c6c8e4e67d7ad483c948055330db5cdb34e2717f8a3daa67bebf695017756bc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits characteristics of a link farm, containing numerous embedded URLs that likely serve to manipulate search engine results or redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of links to known malicious redirectors further supports this assessment. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to direct users to potentially harmful 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=tipos%20de%20variables%20estadisticas%20cualitativas%20y%20cuantitativas%20pdf In PDF document text
    • http://files.epub-free.com/uploads/1/3/0/7/130740180/b140219.pdfIn PDF document text
    • http://files.tashtullyillustration.com/uploads/1/3/1/6/131637850/fopuliperolom.pdfIn PDF document text
    • http://files.decgallery.com/uploads/1/3/1/3/131384789/cc8b20d.pdfIn PDF document text
    • http://files.anchoryourfootprint.com/uploads/1/3/1/6/131636700/nigekibajajunakujet.pdfIn PDF document text
    • http://files.professionalcapitalpartners.com/uploads/1/3/1/4/131438766/4121815.pdfIn PDF document text
    • http://files.selkicasarpg.com/uploads/1/3/1/6/131637057/8beeecc57.pdfIn PDF document text
    • http://files.capcitybeerfest.com/uploads/1/3/0/8/130813846/242747.pdfIn PDF document text
    • http://files.brushandbranch.co/uploads/1/3/0/7/130740344/2297158.pdfIn PDF document text
    • http://files.incavalelagottos.com/uploads/1/3/2/7/132740418/9002638.pdfIn PDF document text
    • http://files.tracystreks.com/uploads/1/3/1/4/131411197/6909191.pdfIn PDF document text
    • http://files.mjratts.com/uploads/1/3/1/6/131636833/8551689.pdfIn PDF document text
    • http://files.comfortembroidery.com/uploads/1/3/0/8/130874018/87ba85933e9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://valunip.files.wordpress.com/2020/06/kogakodife.pdfIn PDF document text
    • https://janavitim807994190.files.wordpress.com/2020/06/92367228780.pdfIn PDF document text
    • https://nulogep.files.wordpress.com/2020/07/62237147795.pdfIn PDF document text
    • https://sazirivukufo.files.wordpress.com/2020/07/58701447167.pdfIn PDF document text
    • https://vasoponox.files.wordpress.com/2020/06/kaniva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/15138334831.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rumifagekesodurelakalon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16711599054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42778697636.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B51 5284 bytes
SHA-256: 8932b84da2ed1591aef6807430e148cfeb48bb2f358c74047eb971f58262e48f
font_01_sfnt_off00008d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D58 11400 bytes
SHA-256: 3d06e9a33d2cf3ddf045b619a17d37c5aa98ca9965f34ad7384013feda747263