Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25c5dfd8cfe11e8…

MALICIOUS

PDF

34.7 KB Created: 2020-08-31 11:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 017f05004d8791b20d0f5e725758e226 SHA-1: 0008c00e7127eadf9dc69c637b6262a851a540aa SHA-256: f25c5dfd8cfe11e8653977e577a4479220a9b13763b2bcccce3c7ddc944a935d
150 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 pointing to ttraff.com. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to static.usrfiles.com. The ML classifier also strongly flagged this PDF as malicious. The primary malicious indicator is the redirector URL, which is likely used to funnel users to a phishing or malware-hosting site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=biochemical+engineering+fundamentals+solutions+manual+pdf
    • https://static.usrfiles.com/ugd/b8c837_cc105667636b409cac439df943fa0c99.pdf
    • https://static.usrfiles.com/ugd/23e9be_adac0506effd409d9d97b9c546c06e55.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb8056e2478d4a9590e3d1a63ee3de1e.pdf
    • https://static.usrfiles.com/ugd/cc03df_7b2ec0adb59b4a209bedb0e702ac74e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5d9d772ef3049d38fbfb0259d316877.pdf
    • https://static.usrfiles.com/ugd/f65518_a9bf1a35797f4d3bbbd2fbba14372236.pdf
    • https://static.usrfiles.com/ugd/314c35_b89e6e0a2a984b6ea5bc5107e266977a.pdf
    • https://static.usrfiles.com/ugd/daca0d_7358711d4f1448419383e8a9408fd1ea.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_8c0ac78548054e5b98db28a0ac1418e9.pdf
    • https://cdn.shopify.com/s/files/1/0438/6373/6485/files/segment_reporting_l_g.pdf
    • https://cdn.shopify.com/s/files/1/0440/4350/1733/files/zawaradajovisitejeder.pdf
    • https://cdn.shopify.com/s/files/1/0465/0362/4856/files/71649062161.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/66857220989.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_off000044a5.bin
3f9485f7da10b25f3a7e65cb9ea21ba73171773f9641dcdece2a767016322c88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44A5 5616 bytes
font_01_sfnt_off00005792.bin
d5240d5451e416dd5a91f611fe5410e9060cc3b09b5e2364b89dc0d856eb0460		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5792 11760 bytes

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