Malicious PDF — malware analysis report

Static analysis result for SHA-256 31306f8799270131…

MALICIOUS

PDF

42.2 KB Created: 2020-08-29 16:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4752ab7526dc2bbc74cf56ff3a5408fb SHA-1: 99dd5162154cac2e176ed26adb52ea43a54422c9 SHA-256: 31306f8799270131f04bbe22decca5ca735242049434162bb36620058e0afcf6
120 Risk Score

Malware Insights

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

The PDF file contains a lure related to creating dynamic indexes in Word, but it embeds a link to a known malicious redirector. This suggests a phishing or social engineering attack aimed at directing users to harmful content. The file also contains a large number of embedded links, many pointing to static.usrfiles.com, which is flagged as a link farm, further supporting the malicious intent.

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.com/wix?keyword=como+hacer+un+indice+dinamico+en+word
    • https://static.usrfiles.com/ugd/b8c837_c1ad1773db554516a5eeeab5d8abc465.pdf
    • https://static.usrfiles.com/ugd/b8c837_e51eb82ffb154d6ea71517379899237c.pdf
    • https://static.usrfiles.com/ugd/b8c837_cdfc22dafde64875ada98deafc55b3ca.pdf
    • https://static.usrfiles.com/ugd/db1da1_71d712e18445468ca32179f4f96a0657.pdf
    • https://static.usrfiles.com/ugd/b8c837_9631e454f8c64eb89350741a13eb1129.pdf
    • https://static.usrfiles.com/ugd/b8c837_b88a168183e74e4495651ea79352d3bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_67a3f66482354d5ab616bf35e372793c.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe087dee0ac440b78ff6ddd6c68974aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7c1df167c7144dcb2e091af2a92c45b.pdf
    • https://static.usrfiles.com/ugd/b8c837_07bfda3f47ad47bc857ddf167f47618f.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_a5939f6b7e964c51adcebc4329b1c2ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5fec7998f894ceabaf8546830461235.pdf
    • https://static.usrfiles.com/ugd/353d00_61f9a5f8ef7747b98aaaabf056bef14a.pdf
    • https://static.usrfiles.com/ugd/353d00_af4ebd3294134a6a91625aee25d7f6ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_c63e815e773a4c7ea93a1fa3253f668e.pdf
    • https://static.usrfiles.com/ugd/565485_04aa758ebfed4bf8b592f5dc77681a7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b76a8d3816d4fdfbe9dcf1633979a1f.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_off00006595.bin
ceed727f04918c9a191886814589b5299e815fec39bf24bee658dcb7f48b7a88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6595 4968 bytes
font_01_sfnt_off0000765d.bin
a491e255c9b20371e1dd74a25d4cf463188d5ca14b64b4d2165959a8d3f7707e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x765D 10816 bytes

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