Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa579a1768c76fc…

MALICIOUS

PDF

40.7 KB Authoring application: Nitro PDF
MD5: c4d806980db45b6b14f2f7121330fa38 SHA-1: 527bd32cc04bacc36a9fd7204e60738beb9ce92f SHA-256: ffa579a1768c76fc2a89cbcebc109dfce69cc94dd49fd0297b4c0ba0f2e81880
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to SEO poison, directing users to download a malicious PDF disguised as an 'Adb installer v1.4.2'. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output strongly indicate malicious intent. The primary malicious URL identified is http://cafedonruiz.com/uploads/1/3/0/6/130621432/761f7785e90.pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cafedonruiz.com/uploads/1/3/0/6/130621432/761f7785e90.pdf
    • http://nuswindsymphony.weebly.com/uploads/1/3/0/6/130604162/mizupanatigitadap.pdf
    • http://kuduproducts.com/uploads/1/3/0/5/130590677/8da00b.pdf
    • http://milkywayshirt.com/uploads/1/3/0/6/130639628/130639628.html#adb+installer+v1.+4.+2

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001035.bin
70f0fe4fee8724a003dab1b7c55995a3ddd619383b0ad93e159d8ea3d93e143a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035 9408 bytes

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