Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e4f5dcd1358479…

MALICIOUS

PDF

36.8 KB Authoring application: ImageMagick
MD5: f7e8aa9427cbf5fa35c60f67db487703 SHA-1: 9575b39a5cb20b00f5c01eac8beb5ffabd5c124f SHA-256: 51e4f5dcd13584791cf1229ac0fc7ac4ac4090c8b35f9410ec1d4b4db069a174
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to other PDF files, a technique often used for SEO spam or to distribute further malicious content. ClamAV identified this as Pdf.Phishing.TtraffRobotInstall-7605656-0, and ML classification strongly supports maliciousness. The document body is heavily obfuscated and does not provide clear user-facing text, but the heuristic firings and URL structure indicate a malicious intent to redirect users or host malicious 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://realtimechallenges.com/uploads/1/3/0/4/130476607/9065434.pdf
    • http://thecreameryshop.com/uploads/1/3/0/8/130874133/daseravuxidasej.pdf
    • http://nytenterprise.com/uploads/1/3/0/3/130379251/puzumubazejib.pdf
    • http://shadowbendtest1.com/uploads/1/3/0/6/130603858/855937.pdf
    • http://automateforgood.com/uploads/1/3/0/7/130739502/7250939.pdf
    • http://food.work/uploads/1/3/0/7/130776175/2fcc822c6.pdf
    • http://bauhaus.life/uploads/1/3/0/4/130435892/zaguwisiwoti-ribeluzazes.pdf
    • http://gtarealestate.forsale/uploads/1/3/0/2/130291434/6f19b3c1000de.pdf
    • http://learnfaces.com/uploads/1/3/0/2/130287291/023cc9c7aa71.pdf
    • http://rebeljmarket.com/uploads/1/3/0/7/130775339/zunirolefixeli_masam_xowupediz.pdf
    • http://nihaostyle.com/uploads/1/3/0/6/130605071/wagedusoberas.pdf
    • http://74-123-78-123.mgwnet.com/uploads/1/3/0/5/130588679/130588679.html#access+database+table+size+limit
    • http://nytenterprise.com/upload

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000389c.bin
c487f8a0d675e4eb97338b4a1f61ffdd52fc6070d12481a6eedb1afc3a8e88d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x389C 8008 bytes

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