Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d61dc99de30a5f…

MALICIOUS

PDF

48.5 KB Authoring application: Pdftk
MD5: a271ad00b9b86ade410d5533f731737c SHA-1: 605b93628e43f8490f224bbf0ed7f3d151abcc4b SHA-256: 85d61dc99de30a5ff5d786ea932b428b1782a9959fa0b46ef417f6138cbe946a
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO poisoning or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior, and the ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' further supports a malicious classification. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of links suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://davesbiblestudy.net/uploads/1/3/0/4/130435690/sirozisilir.pdf
    • http://mosaicvoices.net/uploads/1/3/0/4/130476493/c47c76c7.pdf
    • http://aratikreibich.com/uploads/1/3/0/4/130477633/mevogurenejebonopa.pdf
    • http://thaitogether.org/uploads/1/3/0/5/130539114/jererupotelu-wobumatarijen-renivetofajar.pdf
    • http://konstrukcjestalowepila.pl/uploads/1/3/0/4/130488365/zafarozetifi.pdf
    • http://sookeyhairextensions.com/uploads/1/3/0/6/130604104/nipajarobit.pdf
    • http://lexington-mls.com/uploads/1/3/0/5/130538922/6074876.pdf
    • http://thefirstresponsegroupllc.com/uploads/1/3/0/6/130620522/6862411.pdf
    • http://e-proger.site/uploads/1/3/0/6/130639398/funubemebavavitewa.pdf
    • http://nativeuniques.com/uploads/1/3/0/6/130603918/sizejeratadi.pdf
    • http://stingraysbaseballclub.com/uploads/1/3/0/6/130622089/nasuwune.pdf
    • http://bartolomeilaw.com/uploads/1/3/0/5/130550721/130550721.html#power+of+magnification+microscope+definition

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000433f.bin
1d269f634ab73c11f3b4966065b7d9c19712592f510abd002ed21bf1e31af43d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x433F 2944 bytes
font_01_sfnt_off00004cf6.bin
0e1b61e73add48d6c04776718934017f4fe4c3e62858eb2a92e98a24a0587737		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF6 16432 bytes
font_02_sfnt_off0000660b.bin
088eab23217b415cd80a75ae63bd8567f1926bb4289ad471df2ad7d00d4976bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x660B 8456 bytes

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