Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fb2af0a7806543…

MALICIOUS

PDF

43.3 KB Created: 2020-08-31 02:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f865ba8f3031c42956ead56c352fbf68 SHA-1: ed9f43fbb7d33ec68ea4c5501b6a163f7ef05a9a SHA-256: 50fb2af0a78065439d23dccf84d84bf36efdd869f2ad6791be2f8eba02170082
128 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=adobe+acrobat+xi+pro+offline+installer'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs, one of which is 'https://static.usrfiles.com/ugd/d216cb_1fe6b20f2d65497aa96f45b23d19a792.pdf'. The presence of a visual download button lure further supports the malicious intent. No scripts were extracted, but the combination of the redirector and link farm suggests a social engineering attack aimed at driving downloads.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=adobe+acrobat+xi+pro+offline+installer
    • https://static.usrfiles.com/ugd/d216cb_1fe6b20f2d65497aa96f45b23d19a792.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c262cfdec3f45ada39e82d66ff610f6.pdf
    • https://static.usrfiles.com/ugd/d54300_a1c4da5827cb44c19d773d95405cfbd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_82dd0b4838554551a9e9468b73b2aab4.pdf
    • https://static.usrfiles.com/ugd/b8c837_fafeba85272149c8a146bdad6c8026ef.pdf
    • https://static.usrfiles.com/ugd/6df952_b7b95efa8f954f09ac6e95f64bf3e8e7.pdf
    • https://cdn.shopify.com/s/files/1/0461/4186/6137/files/tozofifekeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/1758/5308/files/88041170249.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0273/files/76676524256.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/xuzinibis.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_off00005de5.bin
99ecf8294c503a73a0fe4ccad5e6f4306f14ce8ebfd526d31a6e31b4f428bc5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE5 5136 bytes
font_01_sfnt_off00006f66.bin
f652d3c6f441554ff47bfe315e8e9991643f963c07a252ca5025b321d0c471e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F66 10296 bytes
font_02_sfnt_off00009261.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9261 4324 bytes

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