Malicious PDF — malware analysis report

Static analysis result for SHA-256 525e42388cbd483e…

MALICIOUS

PDF

48.1 KB Created: 2020-08-31 23:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26e8927c4c818d8c4ae86cd7d6748878 SHA-1: 4a917bfc04cf2656305bade52e7f746afc18b4de SHA-256: 525e42388cbd483e8344aaa836aa4595c445cd5850bc06eacbfdffde2cd52fe0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/wix?keyword=sat+practice+test+1+answers+and+scoring'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on Shopify and static.usrfiles.com, indicating a link farm strategy. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern is a lure to a malicious redirector disguised as educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=sat+practice+test+1+answers+and+scoring
    • https://cdn.shopify.com/s/files/1/0429/8434/1657/files/video_by_link_online.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/71181859668.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2297/files/82687132659.pdf
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/53315452161.pdf
    • https://cdn.shopify.com/s/files/1/0432/1116/1768/files/17136329093.pdf
    • https://static.usrfiles.com/ugd/f0e51d_785ea1f292e94d26a0b91afce3f39cfb.pdf
    • https://static.usrfiles.com/ugd/ef7b09_84b207ea15e740e380db2f7d628f691c.pdf
    • https://static.usrfiles.com/ugd/ac51ce_fdc358ef018447a8a94a91592ad3da0b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9eace22d32914984a2f7a99007a56742.pdf
    • https://static.usrfiles.com/ugd/ed64d2_7b612048e62347e9a8d9956b5a1b138b.pdf
    • https://static.usrfiles.com/ugd/23e9be_bd53a23b42ce41bb9a8c1657e0769ab2.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_d76b38039584423fbe4177a43ae4d9ec.pdf
    • https://static.usrfiles.com/ugd/217d68_e11c5111433a4f349de98457d373d9fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd09ff8b39dc45ffbba8d63e1564af44.pdf
    • https://static.usrfiles.com/ugd/4cf28d_66a1969624334c3bb04c1a488b233374.pdf
    • https://static.usrfiles.com/ugd/b8c837_38281d21d2b74252840743180cf1cba7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f09.bin
c2537e25258c12510c65d2cf2ca5f9124afade5d5e58c399b4b4a9b2b5ae8d2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F09 5244 bytes
font_01_sfnt_off000080f4.bin
7eb291491a8b748e9278927906f1e529261a1d5d71e7b444e63b3acab2451932		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80F4 10700 bytes
font_02_sfnt_off0000a574.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA574 4324 bytes

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