Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62df1b35f244328…

MALICIOUS

PDF

44.5 KB Authoring application: Pdftk
MD5: b85946eee0e7face2b3af2a044f4704e SHA-1: a249f1e57f444d155374ff8ce9544dad992daee4 SHA-256: d62df1b35f2443289bbffc67ef7f2f7e12bb5b5859d91c43ed68f4a76dd68d07
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to other PDF files, a technique often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the heuristic 'PDF_SEO_LINK_FARM' suggests the primary goal is to redirect users to a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://www.stocktimingsignals.com/uploads/1/3/0/7/130738962/5413146.pdf
    • http://www.laughingbuckfarmfoundation.org/uploads/1/3/0/7/130740438/9689dfecc98a20.pdf
    • http://riversplusguiding.com/uploads/1/3/0/6/130604765/2830515.pdf
    • http://mysportsmemory.com/uploads/1/3/0/2/130272070/gudisutemagi_fataj_pojataw.pdf
    • http://chelseawarren.net/uploads/1/3/0/3/130379098/2722719.pdf
    • http://anuqa.net/uploads/1/3/0/2/130287997/telomuzada.pdf
    • http://conversioncinema.com/uploads/1/3/0/7/130740297/dfc071de.pdf
    • http://www.theadmissionssherpa.com/uploads/1/3/0/5/130588277/8e7a9b1.pdf
    • http://tppg.co.uk/uploads/1/3/0/7/130775347/nuwuliteji_xibus_walojufejeni_ginur.pdf
    • http://www.beaufortbeautybox.com/uploads/1/3/0/4/130483047/6ee4861d49b2.pdf
    • http://mydripconnect.com/uploads/1/3/0/6/130620936/vibujajunilusiburipu.pdf
    • http://a1345635xstreamtravel.xsideas.com/uploads/1/3/0/8/130873849/130873849.html#ilae+2019+epilepsy

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000544a.bin
7f37420d37b45069c90752a50eac861d762cba25bbffdac61030656a1cce13aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x544A 9228 bytes

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