Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b477576f089ad24…

MALICIOUS

PDF

66.4 KB Created: 2020-08-12 17:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54c17d40cd50d38e1e92e3e739700f6c SHA-1: 9c616c040c812e038a32ee4a128c7260b77079cc SHA-256: 3b477576f089ad24dfded9201e8f86938ec018a0af9210fdf083006ae0b4936d
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=important+english+vocabulary+pdf'. This URL is embedded within the document's body text, disguised as a link to an English vocabulary PDF. The file also exhibits characteristics of a link farm, with numerous external PDF links, many hosted on cdn.shopify.com. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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=important+english+vocabulary+pdf
    • http://files.davelubke.com/uploads/1/3/1/3/131398323/593418.pdf
    • http://files.hansingelangoe.com/uploads/1/3/0/7/130739789/bapizamiva.pdf
    • http://files.gowildfoundation.org/uploads/1/3/1/6/131636855/e1e9781425.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/jokarugusiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5274/files/101_aviones_de_papel.pdf
    • https://cdn.shopify.com/s/files/1/0433/4541/2261/files/95139718882.pdf
    • https://cdn.shopify.com/s/files/1/0438/2100/7005/files/appendicular_and_axial_skeleton.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/gofow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7461/files/70886558042.pdf
    • https://cdn.shopify.com/s/files/1/0434/2336/7335/files/appsc_group_1_draft_syllabus_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/givufixizosu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6042/7928/files/42856125807.pdf
    • https://cdn.shopify.com/s/files/1/0433/6910/3528/files/35813741204.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/bulletproof_web_design.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3160/files/46853304013.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_off0000c54e.bin
dc12ad49f85de83712fe01b104bb50c6ab9aa590d6cb37500e42fdf0c789b2aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC54E 5808 bytes
font_01_sfnt_off0000d8e1.bin
7366adb9af83031b0c16f8b6a365a5d4f4e79307468623d37a593b5517a7389e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 10424 bytes

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