Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3216b39f1ea5f7…

MALICIOUS

PDF

41.1 KB Created: 2020-08-06 21:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7a16ccd873e8dc2e263e25d76953cbe SHA-1: 704ef2311b0c24b25f6dab53a087414c6a101714 SHA-256: 9a3216b39f1ea5f71216f9594b61feb3e6c436ad74f10e773bc20bd83390777d
150 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 pointing to Shopify domains hosting other PDFs, which is indicative of a link farm designed to obscure the final malicious destination. The primary redirector URL, https://ttraff.ru/pify?keyword=toefl+practice+test+2020+pdf, is flagged as malicious. The document body, though heavily obfuscated, contains text related to 'Toefl practice test 2020 pdf', suggesting a lure to trick users into clicking the malicious links.

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/pify?keyword=toefl+practice+test+2020+pdf
    • http://files.mcnairycountytn.org/uploads/1/3/1/8/131857626/ba0c8cf863da7a.pdf
    • http://files.northarlingtoncert.org/uploads/1/3/1/4/131411197/vomizutojixiwo_dufeweradotebuz_damiduzakuta.pdf
    • http://files.busedu.org/uploads/1/3/1/6/131606490/4478013.pdf
    • http://files.whitepeacockcoffee.com/uploads/1/3/1/4/131436971/7dad80.pdf
    • http://files.ramimargron.com/uploads/1/3/1/3/131398419/6190713.pdf
    • https://cdn.shopify.com/s/files/1/0437/4586/9985/files/9817430929.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0314/files/88738938935.pdf
    • https://cdn.shopify.com/s/files/1/0434/3293/5574/files/10960716704.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/funuvusotinepinorevo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/34531196998.pdf
    • https://cdn.shopify.com/s/files/1/0429/3004/5084/files/73392135251.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6735074847.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58014629257.pdf
    • https://cdn.shopify.com/s/files/1/0434/5734/7741/files/bafufigikemesumij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93515438816.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/change_discord_font.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_off00006233.bin
ecc609bffba5d378b31d1480d59db94f6733aa33d789ba21c2c05dc1b369a4c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6233 5372 bytes
font_01_sfnt_off00007487.bin
70bf0be19c82572c16fd1830be3f8c3d15370b9c8b3b9698fbf94f191f4371b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7487 10708 bytes

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