Malicious PDF — malware analysis report

Static analysis result for SHA-256 d653b22df6873151…

MALICIOUS

PDF

40.3 KB Created: 2020-08-31 10:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d9492082d8e2d70ec12d3382b79d0ec SHA-1: b233173267da7ce6754a5bf516de7fefb8c640fa SHA-256: d653b22df68731514639d1478cdc40e0f97628030266e576424a23eaefee0d66
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a common tactic for SEO poisoning and redirecting users to malicious sites. The primary URL, https://ttraff.ru/wix?keyword=glencoe+mcgraw+hill+florida+geometry+textbook+answers, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to textbook answers, suggesting a lure to trick users into clicking the malicious link. No scripts were extracted from this sample.

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.ru/wix?keyword=glencoe+mcgraw+hill+florida+geometry+textbook+answers
    • https://cdn.shopify.com/s/files/1/0434/5928/1048/files/25752803851.pdf
    • https://cdn.shopify.com/s/files/1/0439/8268/4318/files/book_bird_bin_sachivalay_paper_set.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/die_brgschaft_schiller_text.pdf
    • https://static.usrfiles.com/ugd/3fc21f_44b0163bb4ca44b190d2811ee2ca1995.pdf
    • https://static.usrfiles.com/ugd/b8c837_878ff843bf164f8ea95cb9039d221256.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a08abdde3d64b1598a162903453a622.pdf
    • https://static.usrfiles.com/ugd/5be868_9639f71a85c04848aa5c137101c17022.pdf
    • https://static.usrfiles.com/ugd/b8c837_080ec4ffa03b4f358c3fdd87102182c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ed8935f978a4a2e8e66d38e56bbc9ac.pdf
    • https://static.usrfiles.com/ugd/77d535_6775a28887d24497aca95ff0757e1f71.pdf
    • https://static.usrfiles.com/ugd/b8c837_6740bb7f8460431ab36f36b20bc4be53.pdf
    • https://static.usrfiles.com/ugd/067ecb_324870bcf68d4fb8bf4214f2e87d04c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_60cf4f32dd214489bf745d655e20ad50.pdf
    • https://static.usrfiles.com/ugd/5be868_7ad2fcce905e4ccab235d3c199af69cd.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_off00005313.bin
31286dc568c791b6ad6d3ec4e3b659bfdfc95e0d8f59b90d385186b3650dbea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5313 5932 bytes
font_01_sfnt_off00006730.bin
26907657bab3595aa9485ccf42a56985655610fe4bedc0d432b2c37e926f1e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6730 13580 bytes

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