Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e44f762001eeb6d…

MALICIOUS

PDF

45.0 KB Created: 2020-09-01 12:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03d2bbdcb4dbe0385e282a6b88072c4c SHA-1: 5420811120376e63c88baffac477e32110c8dd9a SHA-256: 7e44f762001eeb6d12b33cc48e23bd087d00eeab0e808e7ed48793a49d7b4246
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that leads to a URL associated with known malicious infrastructure. The document body, though heavily obfuscated, contains references to the same redirector URL and a large number of other PDF links, suggesting a link farm designed to obscure the true destination. The ML classifier also strongly indicated maliciousness.

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.link/wix?keyword=gateway+workbook+b1+answers+unit+4
    • https://cdn.shopify.com/s/files/1/0430/8058/1274/files/76400669915.pdf
    • https://cdn.shopify.com/s/files/1/0438/4253/5581/files/renozibukoxiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9023/1974/files/general_information_sheet_for_cooperative.pdf
    • https://static.usrfiles.com/ugd/dc98cc_6fd0b1ee284847d99af17011e7599983.pdf
    • https://static.usrfiles.com/ugd/f6a907_555b9385c85145cb80f5e8a839aa78e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_2834814971b8414ca577aa28b115deb1.pdf
    • https://static.usrfiles.com/ugd/96768c_9541f0c1987d4db38dce2d36ee1206fd.pdf
    • https://static.usrfiles.com/ugd/e33828_0354df2c9c5646c4bd677614292c374d.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce6eef643ae1473992e4e40a475ccbc1.pdf
    • https://cdn.shopify.com/s/files/1/0438/2362/8450/files/315_grosbeak_laredo_tx_county.pdf
    • https://cdn.shopify.com/s/files/1/0431/5034/4352/files/bold_design_fonts_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/3423/8362/files/11236291392.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/monokiv.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_off00006688.bin
89b1a651abd64acdd94cf44390b3556c1938c26dc346f3e0a6b5f92a1154c764		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6688 5216 bytes
font_01_sfnt_off0000787c.bin
27fef6dbb3ae70090abf2caf13fabac600f01bf27c852fedc2dce88bb3b00fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x787C 15152 bytes

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