Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8220efa17328e9…

MALICIOUS

PDF

34.2 KB Authoring application: Smallpdf Desktop
MD5: d401867a36dede23e72c1489c7cc712a SHA-1: 1eefb09e81f1aef3a65bc231013dacd0854317fd SHA-256: 5b8220efa17328e97ac4291ee04f7f897df200c47dc2534ac8f8341d7371ec56
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a phishing or SEO spam campaign. The ML classifier and ClamAV also flagged this file as malicious, with ClamAV specifically identifying it as Pdf.Phishing.TtraffRobotInstall-7605656-0. No scripts were extracted from this sample, but the extensive link farm indicates a likely attempt to redirect users to malicious or deceptive content.

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 http://redjamengineering.co.nz/uploads/1/3/0/3/130323318/wiwebibok.pdf
    • http://getdirtygirl.com/uploads/1/3/0/7/130775730/dotona_tevazob_jeradivare.pdf
    • http://sewmanyblessings.org/uploads/1/3/0/6/130620356/243129.pdf
    • http://heavensentlawnmanicurist.net/uploads/1/3/0/2/130270907/pugatag.pdf
    • http://philadelphiaprek.com/uploads/1/3/0/5/130551836/1822785.pdf
    • http://b-24-thegreenhornet.net/uploads/1/3/0/2/130273993/vajokinani.pdf
    • http://excelscaffoldhire.com/uploads/1/3/0/4/130476263/naniwegono.pdf
    • http://moongsushi.online/uploads/1/3/0/6/130639019/f54455.pdf
    • http://patriciajaggie.com/uploads/1/3/0/7/130775431/25309d0ccc4.pdf
    • http://buislawyer.com/uploads/1/3/0/5/130551266/7967869.pdf
    • http://7levelselling.stefanaarnio.com/uploads/1/3/0/2/130272631/130272631.html#achilles+tendon+pain+recovery+time

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002dea.bin
9bbf9ed75bcf97334746bbfb8050564de4ae4adb80a856cde25cd7d11b0e6cd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2DEA 8700 bytes

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