Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57b5b3aea3a75f0…

MALICIOUS

PDF

40.8 KB Created: 2020-08-29 21:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02be450c74368ada09504b670193e165 SHA-1: 218a753c27e8a24d8d65deb0e27ac32db60b2fb7 SHA-256: f57b5b3aea3a75f04241fa7a20d11f7fc98449a8da23cdfc4771b293ffcff512
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.me'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many of which are to Shopify-hosted PDFs. The document body, though partially corrupted, contains text related to 'Bosquejos biblicos para predicar gratis pdf' and the wkhtmltopdf generator, suggesting a lure to entice users to click the malicious link. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=bosquejos+biblicos+para+predicar+gratis+pdf
    • https://cdn.shopify.com/s/files/1/0439/2887/9272/files/naburutugojodagodalefiman.pdf
    • https://cdn.shopify.com/s/files/1/0427/7665/8087/files/silomizuzarupibejoletegot.pdf
    • https://cdn.shopify.com/s/files/1/0438/2903/5158/files/biomaterials_download.pdf
    • https://cdn.shopify.com/s/files/1/0455/4008/1829/files/85481170900.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/jegisubuno.pdf
    • https://cdn.shopify.com/s/files/1/0433/6238/6079/files/gevobemefi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/97782573777.pdf
    • https://cdn.shopify.com/s/files/1/0431/5768/4375/files/47485962304.pdf
    • https://static.usrfiles.com/ugd/b8c837_8417fa4b33b741ca9dab5101dfc5ddc9.pdf
    • https://static.usrfiles.com/ugd/b8c837_202350c6c4b54632af88f8da9d74f51a.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_off00005a58.bin
b7bd649f28ada2c0cc7d39bf6b9119c589c4791cebb055a740d08ea439776ceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A58 5716 bytes
font_01_sfnt_off00006dd1.bin
bac645cfb0a6db3b65fe9d8bcad59c84a59697e99f9c7277f38d1838fd8790e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD1 12460 bytes

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