Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33cd7eea3ea8042…

MALICIOUS

PDF

106.3 KB Created: 2020-08-10 01:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a341df9e02480c1ce4a6b615af1ccd2 SHA-1: 7e4a3edb88fb1e63cd9cfa2abbb9c2559bb11375 SHA-256: d33cd7eea3ea8042a951b12db47c8224fda91d16615791ed0bc8b2823ff6255d
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body text. This link is designed to lure users into clicking it by appearing to offer calculus problem solutions. The PDF also contains a large number of external links, suggesting a link farm or SEO poisoning attempt. The primary malicious IOC is the redirector URL.

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=thomas+calculus+problems+and+solutions+pdf
    • http://xodop.shootingstarsholden.com/uploads/1/3/0/7/130775162/6459956.pdf
    • http://files.projectusandthem.com/uploads/1/3/0/7/130776460/3693691.pdf
    • http://files.nhlogcabinrental.com/uploads/1/3/1/6/131606733/wiweteselovip_bamanotobuxomep_valafonafovi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87294954422.pdf
    • https://cdn.shopify.com/s/files/1/0430/0154/4863/files/zusogepojusorupaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/82033805863.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6009/files/71520115743.pdf
    • https://cdn.shopify.com/s/files/1/0430/0881/9349/files/34648667142.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/xujaziwabu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5827/3185/files/39513969903.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44219577828.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/how_to_customize_your_discord_server.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/astro_2nd_canadian_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/2644/6496/files/bible_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94662163826.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_off00014861.bin
c81abb5b65d53e29df5dc106d033295011076918fe4b9068369fbe8c222896b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14861 5484 bytes
font_01_sfnt_off00015ad1.bin
1591f9f894003c96a4f727eedb42ab60ab84f9db5a50b2ffbfc13dc1c1c86424		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD1 21588 bytes

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