Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad23a23413766470…

MALICIOUS

PDF

108.4 KB Created: 2020-08-29 17:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 169085b5fe5deebcc87164ca00172c7e SHA-1: 7bd5607ac2195e985c7eb543648cbd0deb816af4 SHA-256: ad23a23413766470f380f64f48752d700b31ca256c7234c5d4be75d28ef86542
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a specific malicious redirector URL, disguised as a solution manual for an accounting textbook. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates the primary link leads to known malicious infrastructure. The PDF_SEO_LINK_FARM heuristic suggests the document is part of a larger SEO manipulation scheme to distribute malicious links. The presence of a visual download button further supports the lure.

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.ru/wix?keyword=accounting+tools+for+business+decision+making+4th+edition+solution+manual+pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0904/files/med_eitleri_rnekle.pdf
    • https://cdn.shopify.com/s/files/1/0437/9167/9639/files/zeleviluvoduxolorutov.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/neviwomupifazorowa.pdf
    • https://cdn.shopify.com/s/files/1/0439/1292/1256/files/vulawotarerivosunoxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0096/files/buzopalezegunomo.pdf
    • https://static.usrfiles.com/ugd/b8c837_4985129fd57a4576b36b95f300dba106.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a6276d66f8341b9a030b75f3b7c5ef1.pdf
    • https://static.usrfiles.com/ugd/10e3af_02fe72a46cbc47eeac3ba71f758c8826.pdf
    • https://static.usrfiles.com/ugd/b8c837_d042d5f62bc949099bf52dafaddab707.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5354/files/2123228966.pdf
    • https://cdn.shopify.com/s/files/1/0431/8229/3151/files/85632584117.pdf
    • https://cdn.shopify.com/s/files/1/0437/6231/9521/files/dcs_a10c_startup_checklist.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_off00016b86.bin
41a8fc73962fa43d48a48f2007ab0e45727818f52085d811b5ed7237515fa0ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B86 5852 bytes
font_01_sfnt_off00017f45.bin
1affea0662542db50be71eb0cb890ec00056f98c46ddd16e2a15814025bc5593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F45 10816 bytes

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