Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b59597b196273d…

MALICIOUS

PDF

34.2 KB Created: 2020-08-10 20:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6871235aa47dc92b2ea662344d0466d SHA-1: 2b5c713b30c83738be19688ac5dc9ccaba160266 SHA-256: 93b59597b196273dbcbea7ff03b7ad51f69ff5f10ca36d66aa2914ca4c44c642
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains references to academic books and URLs, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=abstract+algebra+thomas+w+hungerford+pdf
    • http://files.seattlestereo.com/uploads/1/3/0/8/130873820/3615345.pdf
    • http://files.wendyestorgamusic.com/uploads/1/3/2/7/132741225/xitujejasudub.pdf
    • http://logara.catharsisfightingthedrugepidemic.com/uploads/1/3/1/4/131407668/4663528.pdf
    • http://files.9488.kofcva.org/uploads/1/3/1/6/131636965/wegow-xetitotewidawok.pdf
    • http://files.synergyresearchlabs.com/uploads/1/3/2/6/132696194/41d9db44e6b0.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/68810768056.pdf
    • https://cdn.shopify.com/s/files/1/0428/3006/9927/files/dobarimume.pdf
    • https://cdn.shopify.com/s/files/1/0432/5254/7739/files/vodotitanipi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/86477918810.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40948382406.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31968244380.pdf
    • https://cdn.shopify.com/s/files/1/0438/2588/9442/files/50661446765.pdf
    • https://cdn.shopify.com/s/files/1/0437/5930/4858/files/garmin_gpsmap_60csx_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2099/files/97387359365.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/10109725017.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2465/files/23667959972.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_off000046f2.bin
e53e763ba37f1436e859642d8d8ca369a8421272eee6f5c780922337ce57db40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46F2 5788 bytes
font_01_sfnt_off00005a7b.bin
899cd2411611cf58095d012795b7db5e80d2ba489cd414be993ff0ff28edfb8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A7B 9780 bytes

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