Malicious PDF — malware analysis report

Static analysis result for SHA-256 99af17c40625f9f1…

MALICIOUS

PDF

40.4 KB Created: 2020-08-29 21:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4aff8d9405fc7e70e5c404326ab8afc6 SHA-1: 29ebf34aa1f018007dcb6670a779c03f31b1c88c SHA-256: 99af17c40625f9f1b98398abfcd8b60a27bd7e03c1f6dd8d529daf036cdfa66d
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating a link to known malicious redirector infrastructure. Additionally, PDF_SEO_LINK_FARM indicates the presence of a large number of external PDF links, likely intended to manipulate search engine results or lure users. The primary malicious IOC is the redirector URL, which is likely used to deliver a secondary payload or phish for credentials.

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=stationary+phase+polar+or+nonpolar
    • https://static.usrfiles.com/ugd/b8c837_ca8b31c9d3a34512a3594702ac7bedb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_03d259996dd64838b3db716435c0e20a.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f0d6ebb48224e0291c738e83f12f25a.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ba0a978e0bb41e2972748cc6b0578d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_fdac5216c419411fbf86e9ccc374eabb.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d8d25558c324058b98cf572a12700a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca8dce59ae8643be993c3adc33c90af7.pdf
    • https://static.usrfiles.com/ugd/76156b_29cbe0e856574c38b55cfb6f32596063.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc7a0b5618484dca89d0d83502fb0d85.pdf
    • https://static.usrfiles.com/ugd/b8c837_54b90e902b8b4aa9ade104185c577f00.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/cat_verbal_ability_questions.pdf
    • https://cdn.shopify.com/s/files/1/0434/7537/0136/files/11950119090.pdf
    • https://cdn.shopify.com/s/files/1/0430/8520/1561/files/nidesis.pdf
    • https://cdn.shopify.com/s/files/1/0432/5215/4532/files/tirijimuxasiwisosetilolon.pdf
    • https://cdn.shopify.com/s/files/1/0445/6457/8463/files/castrol_lmx_li_komplexfett.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/
    • https://static.usrfiles.com/ugd/b8c837_3d8d25558c324058b98

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f22.bin
8521dbe520be699088725519452f8e3787972bc32380ce64e7c539728e53c1ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F22 5112 bytes
font_01_sfnt_off0000707b.bin
dc3b39ff24b71ed7d4c771a3c9dfa11b96e8ca436e729fe03518dd46656477b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707B 10600 bytes

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