Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c19656ef8b556db…

MALICIOUS

PDF

46.8 KB Created: 2020-09-06 11:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a4bc0f4793c35c4a39ad8f5dbc4c0b2 SHA-1: b31fa31480f0ff4d8a94cf8d3565cd9c15559db3 SHA-256: 7c19656ef8b556db089697160f366020a3281e9721c92e896426d44440b96f64
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with many links pointing to static.usrfiles.com, and one critical link to a known malicious redirector at ttraff.me. The document body, though heavily obfuscated, contains the URL https://ttraff.me/pify?keyword=nelson+handwriting+worksheets+printable, suggesting a lure to download or view content related to handwriting worksheets. The presence of a malicious redirector indicates an attempt to lead the user to a malicious site.

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/pify?keyword=nelson+handwriting+worksheets+printable
    • https://static.usrfiles.com/ugd/7f614e_3a04206ca15a4e50aa9243ca602845fc.pdf
    • https://static.usrfiles.com/ugd/5b5da7_85a272960322493391bfe92ba9a293b5.pdf
    • https://static.usrfiles.com/ugd/2072cd_ec5bb8b2c51442e5a50f1c2d62a513b1.pdf
    • https://static.usrfiles.com/ugd/f55bec_d8c0f4b64fd04d71a6a78b500d1c8a9f.pdf
    • https://static.usrfiles.com/ugd/8b49c6_47a7106802d740d8a4105a931ddb6062.pdf
    • https://static.usrfiles.com/ugd/724bd4_08afb3d520d548428a48097ca79fd388.pdf
    • https://static.usrfiles.com/ugd/8ff694_f47d029681db46cca8461f03fb117944.pdf
    • https://static.usrfiles.com/ugd/599f1c_558bb68be47a465fa196088db5dc250d.pdf
    • https://static.usrfiles.com/ugd/b8c837_754c1c18b95647f98a32f85d41fee370.pdf
    • https://static.usrfiles.com/ugd/f59309_320a87a949734ce7a16645c9356ea743.pdf
    • https://static.usrfiles.com/ugd/5360f8_a92e34fc05134028b98d1b828325b25f.pdf
    • https://static.usrfiles.com/ugd/2c76f4_dcfc77d2f83d45a188b7c3c0429c0ca2.pdf
    • https://static.usrfiles.com/ugd/ced2dc_5b75e8995532420f99083b3f43da3539.pdf
    • https://static.usrfiles.com/ugd/a44510_bc32f2b5a842466384980c2791ccf9b2.pdf
    • https://static.usrfiles.com/ugd/516793_8f18e7df0e804541a5e6128c65eab5c6.pdf
    • https://static.usrfiles.com/ugd/80c1db_eeda87649db84521917fc3c527946a13.pdf
    • https://static.usrfiles.com/ugd/b52961_9d8502d0d62d479ba7b37818ca3065c6.pdf
    • https://static.usrfiles.com/ugd/32acb1_132d0039c2b84d93b541149401d30a70.pdf
    • https://static.usrfiles.com/ugd/b8c837_c598b7bdad7a439781b4161b006a2d23.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_off00007468.bin
85f6371993409cee394d4f87b79525a1869a30b95265bc0c33d8367bb8ed8ddf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7468 5484 bytes
font_01_sfnt_off00008715.bin
e500bfb541e0f9415ac5aeb7ec6193a9bf9ea87792795e7688e85eb481ed3895
pdf-font-stream PDF embedded font (sfnt) at offset 0x8715 11196 bytes