Malicious PDF — malware analysis report

Static analysis result for SHA-256 a539d2cbf1437712…

MALICIOUS

PDF

29.6 KB Created: 2020-03-28 14:15:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 32ac2436ac4671e0c1b03778710724a8 SHA-1: af7494596c8b4c753d3c35f8312c9e7feb930c61 SHA-256: a539d2cbf1437712f0d3e1770d6aa131c723d5ba53f963cdbe640a0644ed62e0
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains. This technique is often used for SEO poisoning or to distribute malware. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted, but the sheer volume of external links suggests a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://growmygardens.com/uploads/1/3/0/6/130605279/130605279.html#a+chorus+line+full+script+pdf
    • http://zofe.fr/uploads/1/3/0/3/130323285/3870565.pdf
    • http://jordankevin.com/uploads/1/3/0/4/130476050/dotuzufik-litonarumakawes-xekoxa.pdf
    • http://midsouthgaragedoors.com/uploads/1/3/0/4/130477541/f7aa0fbef.pdf
    • http://www.barbwire.studio/uploads/1/3/0/7/130739875/66efd26ed57ec4a.pdf
    • http://mta-sts.mail.anamcarafolkmusic.com/uploads/1/3/0/5/130590297/ee71769c7091c.pdf
    • http://associazionedareprotezione.org/uploads/1/3/0/8/130814104/458768.pdf
    • http://geniusplaylab.com/uploads/1/3/0/6/130604193/01d36429a8e6d.pdf
    • http://mta-sts.mx.broadbandsings.org/uploads/1/3/0/4/130483215/rufuvudosanijunopis.pdf
    • http://mx.bethelurcaylmer.com/uploads/1/3/0/5/130551235/7898324.pdf
    • http://ayeartochangeyourlife.com/uploads/1/3/0/7/130776445/zepafo.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ee8.bin
af6664d20330a63570ca834ecc50156f739e46bd2e7cee4a5c494706723ec2b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EE8 6764 bytes

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