Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6acdb950118a8d3…

MALICIOUS

PDF

40.4 KB Created: 2020-09-08 04:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a0e2eb9e2d26df16dc825374136b9b1 SHA-1: 6f0d61dc1d39d0c5bc68f1fdbbdee0dfd737fa60 SHA-256: d6acdb950118a8d3c8ca39d8f4a339c76ecd21d7cd695b88312512aa3e9bc93c
120 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, which points to a URL designed to deliver a malicious payload. The document body and embedded links suggest a lure to download a modified application, likely malware. The presence of a large number of external PDF links, many pointing to static.usrfiles.com, indicates a link farm strategy to improve search engine visibility for the malicious lure.

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=block+strike+mod+apk+5.+8.+6
    • https://static.usrfiles.com/ugd/b1277d_b77d907f8f034dddad00d4df2bd0b370.pdf
    • https://static.usrfiles.com/ugd/b85eb0_110d0edf10064e408479821c5ec44119.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_50a3a11b3aab4daebadee63e9da486c4.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_10c20212fa4f4e4ba4b4068869dc3389.pdf
    • https://static.usrfiles.com/ugd/10e3af_4c5a9f1f87594fe3a32435ea679ec625.pdf
    • https://static.usrfiles.com/ugd/9757e7_2d9a56d4b2404c3bba564cc2087a6250.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_b75712fec7084a8e9fca9031ea7f069c.pdf
    • https://cdn.shopify.com/s/files/1/0435/2429/2762/files/8109339281.pdf
    • https://cdn.shopify.com/s/files/1/0433/8683/0998/files/sefuzorojesezumida.pdf
    • https://cdn.shopify.com/s/files/1/0449/3488/9627/files/que_viva_la_musica_andres_caicedo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3387/7914/files/tarotobuvikex.pdf
    • https://cdn.shopify.com/s/files/1/0441/0025/5896/files/58045297963.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_off000052d2.bin
29ca6b4f271f95d0af1b119d0df5056a26d8786020f75e790be47ccf0d213c5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52D2 5836 bytes
font_01_sfnt_off000066a0.bin
b6c492801f915d40fc1ca85b8bf5f0c933d65f6c993e2910747cf1ba2d7067fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A0 14472 bytes

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