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)
MD5: abfb9eae2b5694e121db4995b7675b47 SHA-1: ffd451fd21cf917b1d10286b7fac61ed504573f5 SHA-256: 0c6c8e4e67d7ad483c948055330db5cdb34e2717f8a3daa67bebf695017756bc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, directing to external PDF files. One of these links, https://ttraff.ru/wb?keyword=tipos%20de%20variables%20estadisticas%20cualitativas%20y%20cuantitativas%20pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to lure users to malicious or SEO-manipulated content. No scripts were extracted, but the presence of embedded URLs and the malicious redirector link strongly indicate a malicious intent.

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.ru/wb?keyword=tipos%20de%20variables%20estadisticas%20cualitativas%20y%20cuantitativas%20pdf
    • http://files.epub-free.com/uploads/1/3/0/7/130740180/b140219.pdf
    • http://files.tashtullyillustration.com/uploads/1/3/1/6/131637850/fopuliperolom.pdf
    • http://files.decgallery.com/uploads/1/3/1/3/131384789/cc8b20d.pdf
    • http://files.anchoryourfootprint.com/uploads/1/3/1/6/131636700/nigekibajajunakujet.pdf
    • http://files.professionalcapitalpartners.com/uploads/1/3/1/4/131438766/4121815.pdf
    • http://files.selkicasarpg.com/uploads/1/3/1/6/131637057/8beeecc57.pdf
    • http://files.capcitybeerfest.com/uploads/1/3/0/8/130813846/242747.pdf
    • http://files.brushandbranch.co/uploads/1/3/0/7/130740344/2297158.pdf
    • http://files.incavalelagottos.com/uploads/1/3/2/7/132740418/9002638.pdf
    • http://files.tracystreks.com/uploads/1/3/1/4/131411197/6909191.pdf
    • http://files.mjratts.com/uploads/1/3/1/6/131636833/8551689.pdf
    • http://files.comfortembroidery.com/uploads/1/3/0/8/130874018/87ba85933e9c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://valunip.files.wordpress.com/2020/06/kogakodife.pdf
    • https://janavitim807994190.files.wordpress.com/2020/06/92367228780.pdf
    • https://nulogep.files.wordpress.com/2020/07/62237147795.pdf
    • https://sazirivukufo.files.wordpress.com/2020/07/58701447167.pdf
    • https://vasoponox.files.wordpress.com/2020/06/kaniva.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/15138334831.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rumifagekesodurelakalon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16711599054.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42778697636.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

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

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