Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8e290c412a5e8f…

MALICIOUS

PDF

54.3 KB Created: 2020-08-21 12:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b11cf730170c7654c15df3ed09c16b61 SHA-1: 18d5bae5ebd6658b9d5251416e127570807b7128 SHA-256: 3a8e290c412a5e8f8e14011bb6e564ee414e483b0ec509d98afc62fe5fd72ee6
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for a 'quadratic equation worksheet grade 9 pdf'. The presence of a large number of external PDF links, many pointing to Shopify domains, suggests a link farm designed to obscure the malicious redirector. The primary malicious IOC is the ttraff.com URL, which likely leads to further malicious content.

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.com/pify?keyword=quadratic+equation+worksheet+grade+9+pdf
    • http://funazesev.withoutahitchboston.com/uploads/1/3/1/6/131606289/655be813e8d0a.pdf
    • http://files.orienmcneill.com/uploads/1/3/1/4/131409761/9503586.pdf
    • http://zanunigi.cardiac-imaging.org/uploads/1/3/1/4/131408899/2950374.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/ketux.pdf
    • https://cdn.shopify.com/s/files/1/0429/3305/9737/files/32560245947.pdf
    • https://cdn.shopify.com/s/files/1/0431/8517/6736/files/list_of_medical_abbreviation.pdf
    • https://cdn.shopify.com/s/files/1/0444/0273/7318/files/bicarbonate_de_soude_utilisation.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/texakiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12509012650.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/axis_bank_deposit_rates.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/dozijufu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2809/4882/files/68129324237.pdf
    • https://cdn.shopify.com/s/files/1/0429/6038/8262/files/womizefilawepujatukumuka.pdf
    • https://cdn.shopify.com/s/files/1/0438/9535/7595/files/kuvaludawapakosi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006561.bin
f61a16266a9a37bb9aa5f9df01f35f70f64e9a9a94104883103c388bed86ae7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6561 5768 bytes
font_01_sfnt_off0000790b.bin
a63fc6dae66cc46f37dc81dcb8cece2ffd22f2691b6d7976c82e0cb43e39deed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790B 14272 bytes
font_02_sfnt_off0000a683.bin
639ff136164d3cf52e46fc96d4136bc6687456cfbb76127ec05c0065cff0b848		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA683 16688 bytes
font_03_sfnt_off0000bda0.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA0 4324 bytes

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