Malicious PDF — malware analysis report

Static analysis result for SHA-256 79713754a5956d45…

MALICIOUS

PDF

37.2 KB Authoring application: OpenOffice Draw
MD5: 86ea1487e34914b23d0920f49050e6b6 SHA-1: 37be6f24b831a0505a84ceb96bd04835c1789ce6 SHA-256: 79713754a5956d45530582b0e8572f266bf59bd61b79305511922a2815436dbb
192 Risk Score

Malware Insights

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

The PDF document contains a mass of external links, many of which point to other PDF files, indicating a link farm designed to distribute malicious content. The heuristic PDF_SEO_LINK_FARM and PDF_RANDOM_URL_LINK firings strongly suggest this malicious intent. The embedded URLs are likely used to redirect users to further malicious sites or downloads, potentially serving as a distribution mechanism for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://asthethirdworldinnorthamericaturns.com/uploads/1/3/0/5/130590051/cf50b399fd154b.pdf
    • http://nyanyaekaterinburg.ru/uploads/1/3/0/4/130483634/radabiriko.pdf
    • https://rorenejafudido.weebly.com/uploads/1/3/0/2/130291588/5247399.pdf
    • http://vertes.com.sg/uploads/1/3/0/5/130589199/130589199.html#categorias+gramaticales+y+ejemplos+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001020.bin
a62b3afc1584e8715d1cdde4cba00f2162e82b12a0dde5153aa7c7f587c86a76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020 8876 bytes

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