Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a27cb1804bd86b…

MALICIOUS

PDF

40.0 KB Authoring application: pdf-parser
MD5: 1003bda96e802f09430f844cb81ae4f8 SHA-1: 91b0bd1211378d9a6446f377915591571fd566e2 SHA-256: b4a27cb1804bd86bb8fd5deb9bee8d74b7f919a541c6996cfcbaa795740413c8
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO poisoning or to direct users to malicious content. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output strongly indicate malicious intent. The primary attack pattern involves redirecting users to a link farm, likely to host phishing pages or further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 https://kukovezugofixe.weebly.com/uploads/1/3/0/5/130547846/tazozewukif.pdf
    • http://hbdsw.org/uploads/1/3/0/6/130621706/fodulon-wejimesagi-kasolofu.pdf
    • http://jeremyclwong.com/uploads/1/3/0/4/130477135/toxulewewutazilas.pdf
    • http://jevolare.paypal-support-limitted.com/uploads/2020/01/28/zarabejad_tivakupame_pisaxe.pdf
    • http://bkhouse.services/uploads/1/3/0/6/130639114/e60fa7.pdf
    • http://jad.pp-offer.icu/uploads/2020/01/27/11ec7d8969.pdf
    • http://lifestylebydesiree.com/uploads/1/3/0/6/130604231/wojokegixipu.pdf
    • http://scubatribemaldives.com/uploads/1/3/0/5/130551704/lawuf.pdf
    • http://silverbulletgunworks.com/uploads/1/3/0/6/130605393/623562cdad.pdf
    • http://droscarparada.com/uploads/1/3/0/3/130323250/numemoputolevikijudi.pdf
    • http://jigivixe.vrkuzbass.online/uploads/2020/01/28/didaxafon.pdf
    • http://saundrarandazzo.com/uploads/1/3/0/6/130605517/tuwoz.pdf
    • http://caylahwestphotography.com/uploads/1/3/0/4/130483767/dimunadolulewun_tozixaru_vutetuv.pdf
    • http://millsacthelp.com/uploads/1/3/0/5/130551475/130551475.html#template+powerpoint+business+presentation

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000013d3.bin
27448d2bcfc7526b81562aeeefedebf4175898964abe19faad4375c90d6ff580		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3 8196 bytes

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