Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cb71e10d6f9ff7…

MALICIOUS

PDF

34.1 KB Created: 2020-08-03 21:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aab287662b06f98eeac014a9a103eeb5 SHA-1: 25a9bf37f14d6e1b88cc4ef74aa295c0468a31bd SHA-256: a9cb71e10d6f9ff7fb88a9b4fc6b89fb63093aa5a8a5f9de3cf00ef160417f9b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to domains associated with link farms or redirectors, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The primary redirector URL is https://ttraff.ru/wb?keyword=thesis%20archiving%20system%20pdf. The ML classifier also strongly flagged this PDF as malicious. The document body itself is largely unreadable binary data, but the presence of numerous links suggests a social engineering or SEO spam attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://ttraff.ru/wb?keyword=thesis%20archiving%20system%20pdf
    • http://files.mixelle91.com/uploads/1/3/2/7/132710661/panogiro_nalokoripo_nusume.pdf
    • http://bukumuwop.bigrotties.com/uploads/1/3/1/4/131407227/f9b0bc4ab91d444.pdf
    • http://files.oratoryschools.org/uploads/1/3/0/7/130776066/cd1ea339.pdf
    • http://files.supportupnurses.org/uploads/1/3/2/6/132695347/doxutelotewefeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/xomojalesunupiporajegeke.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/detuxupawelezenitotab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71895705060.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdf
    • https://cdn.shopify.com/s/files/1/0435/5214/5560/files/how_to_open_ports_on_arris_router.pdf
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/63269796075.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/fubebabasetu.pdf
    • https://cdn.shopify.com/s/files/1/0438/7130/5896/files/26857270492.pdf
    • https://cdn.shopify.com/s/files/1/0437/3171/4199/files/40482727237.pdf
    • https://cdn.shopify.com/s/files/1/0439/7596/6878/files/6529281148.pdf
    • https://cdn.shopify.com/s/files/1/0440/7659/7400/files/forin.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_off000047aa.bin
f57e6521557d3d02ff833c6e89a1a54121fa5fd7815268aac310ac0cbd2d80f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47AA 5648 bytes
font_01_sfnt_off00005ac2.bin
c73b786d471486cb9bdaf17168c2682eb0e736c1ee671ee35950c1c316aaa9e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC2 9740 bytes

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