Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be657473efcb727…

MALICIOUS

PDF

35.6 KB Created: 2020-08-31 06:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89bfce72be95ef5db901f80cbe1f0687 SHA-1: 5c51ebdee68052046761a1f5ceaec31e75270bc1 SHA-256: 7be657473efcb7271903e60811cf00f1df3fb8eefdb3f2ec92565d2e61848fb6
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'equation writing practice problems' and the malicious URL, suggesting a lure to a scam or phishing site. The presence of numerous links to external PDFs, many hosted on static.usrfiles.com, indicates a link farm designed to improve SEO for the malicious redirector.

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.cc/wix?keyword=equation+writing+practice+problems+level+2+answers
    • https://static.usrfiles.com/ugd/5926b4_445ad4f083e940af8047ebf09d73e3ec.pdf
    • https://static.usrfiles.com/ugd/c345b0_507d65a88a84401fb9814af1dacb0d68.pdf
    • https://static.usrfiles.com/ugd/fe83c3_9b754fa29e704c9ca8b0e099a13f1d1c.pdf
    • https://static.usrfiles.com/ugd/a48928_17222ffd26e24c8799bee6d68c67f880.pdf
    • https://static.usrfiles.com/ugd/b8c837_50fb5fd106654119a8fcc2913c9d35d5.pdf
    • https://static.usrfiles.com/ugd/f4de5e_aae1ac07530940109fe9ac9c0899a099.pdf
    • https://static.usrfiles.com/ugd/8ba634_445fe52e1c9a46d19d3fb5f1bdf0cb2a.pdf
    • https://cdn.shopify.com/s/files/1/0433/3653/2136/files/cavernous_malformation_stroke.pdf
    • https://cdn.shopify.com/s/files/1/0440/7079/7462/files/latefobelape.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_56e58cec8e064e19bc359398b1697f87.pdf
    • https://static.usrfiles.com/ugd/b8c837_16064dedc23c41148a2f399905ceec76.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3ac721f6209430e97512b755d429ab6.pdf
    • https://static.usrfiles.com/ugd/b8c837_01e1234bd0d24316aa0dcd253e7169a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_c92885005f1e4e63921941a4326e60d0.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_off00004d31.bin
6f0e69722249cb191768600332f1779eba4e559db9fc7a74021d933ea14d87bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D31 5760 bytes
font_01_sfnt_off000060ce.bin
766e090f6151c2bc2e6d7ee6145340614090dfd8e7951de832db8886d8dd02c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60CE 9572 bytes

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