Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb982aaee445bce6…

MALICIOUS

PDF

32.9 KB Created: 2020-08-05 23:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3da2787f0fcaa63ed28d1b91452b6eb8 SHA-1: 00d9bf073d19f75f5869b08ab10bc3b9dcbb916e SHA-256: bb982aaee445bce6bc0348e683a8a91b33907ed3f37c48cb036dfc6730530de0
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are designed to appear as academic resources. The primary malicious link, https://ttraff.cc/pify?keyword=skehan+a+cognitive+approach+to+language+learning+pdf, acts as a redirector to further malicious infrastructure. The document body itself is heavily obfuscated but contains references to the academic lure and the PDF creation tool.

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=skehan+a+cognitive+approach+to+language+learning+pdf
    • http://files.c-levelexecs.com/uploads/1/3/2/7/132710750/ladisavejiraja-nuruwomuruse-falibiwugosa-revijujagozomez.pdf
    • http://files.cloverdalebarn.com/uploads/1/3/1/4/131484328/fobudokisijifemed.pdf
    • http://files.wildtimes.co.uk/uploads/1/3/0/7/130775950/sifukajebuk.pdf
    • http://files.linwoodrumney.com/uploads/1/3/2/7/132710748/9470818.pdf
    • https://cdn.shopify.com/s/files/1/0440/6712/7446/files/fokagamopitesuwamexumiwo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9620/3679/files/sibusomuzomopulolefoxikam.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/39287210660.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xizijifopaxefiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/0002/0635/files/22362293662.pdf
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/novupuje.pdf
    • https://cdn.shopify.com/s/files/1/0435/4582/1338/files/ropokakunirapolarenere.pdf
    • https://cdn.shopify.com/s/files/1/0429/2516/2652/files/jolil.pdf
    • https://cdn.shopify.com/s/files/1/0432/5448/1056/files/figubo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4256/files/kofijenesonuli.pdf
    • https://cdn.shopify.com/s/files/1/0438/1766/4674/files/labifobokorajos.pdf
    • https://cdn.shopify.com/s/files/1/0429/0543/6326/files/rojipipamebur.pdf
    • https://cdn.shopify.com/s/files/1/0438/0144/4514/files/rurolofopip.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_off00004582.bin
4bbbbe6c41340ea8a3fdfe85c17b2d38ec93f544ac6d0397ba89f8b707193e20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4582 5464 bytes
font_01_sfnt_off0000581f.bin
40b3ce7e4ff7c36bc481828b642f182af71adb0ab5f32274860bf02043e21207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x581F 8900 bytes

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