Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddd2dd6c494be3b…

MALICIOUS

PDF

43.5 KB Created: 2020-03-30 03:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9b7fc89926d24cbf25df38b18ddae35a SHA-1: cb410899e35b3134de0185e2482cfd1ed8c5370b SHA-256: cddd2dd6c494be3b84fdc6d07f98018289be35097445684c7944281145d8dc7f
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains one of the URLs, suggesting the primary purpose is to act as a link farm, potentially for SEO manipulation or to distribute further malicious payloads via the linked PDFs.

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://sta-66-99-58-208.ladse.org/uploads/1/3/0/7/130776852/130776852.html#esfuerzo+de+fluencia+del+acero+astm-a36
    • http://carakuandroidku.com/uploads/1/3/0/7/130740174/magimumat.pdf
    • http://globaly.services/uploads/1/3/1/4/131437671/2516079.pdf
    • http://pierrepaulbitton.net/uploads/1/3/0/6/130621941/4005151.pdf
    • http://toddcedarcreeklake.com/uploads/1/3/0/2/130289733/ce72505261cb1.pdf
    • http://svconsultoriajuridica.com/uploads/1/3/0/5/130588540/kawiwigos.pdf
    • http://rasterinterrupt.net/uploads/1/3/1/4/131438310/363aa3cff11b9.pdf
    • http://angalena.com/uploads/1/3/0/5/130588266/1b2f43a442b.pdf
    • http://citruscountygolfcarts.com/uploads/1/3/0/2/130291579/8d3a1.pdf
    • http://webdisk.mentawaidaze.com/uploads/1/3/0/2/130273931/lapevux_bulexijite.pdf
    • http://arcosoffice.com/uploads/1/3/0/6/130603785/7386368.pdf
    • http://nevadachallenger.net/uploads/1/3/0/7/130776516/f617477.pdf
    • http://terragia.org/uploads/1/3/0/5/130543813/sifodeg-lamunup.pdf
    • http://mineinmystic.com/uploads/1/3/0/8/130814342/51dd156a2e7b70.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006769.bin
898fa300b2a401853c3dff312d946d596a55cbe5894a2bcaf70b6f2a0684ffa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6769 9812 bytes
font_01_sfnt_off0000894a.bin
b4eaba1313c2ae02e0840532e8df49817f4492e706e7fc7006fa435ca033da2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x894A 16208 bytes

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