Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d687d7df76d513…

MALICIOUS

PDF

41.8 KB Created: 2020-08-31 07:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4540a5776016b429d01591deee8f00a1 SHA-1: c114f7c5a78a70fad9d9f9d645d7d88152436fb7 SHA-256: f6d687d7df76d51319b9294745302d77bd961e3562984107a5fc15b854d8da26
128 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF also contains a large number of external links, many hosted on cdn.shopify.com, suggesting a link farm for SEO poisoning. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. The presence of a download button lure further supports a malicious intent.

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=cpcu+530+study+guide
    • https://cdn.shopify.com/s/files/1/0432/0378/8960/files/disup.pdf
    • https://cdn.shopify.com/s/files/1/0429/3168/3484/files/proyecto_de_tesis_ucv.pdf
    • https://cdn.shopify.com/s/files/1/0435/5257/1555/files/kagorajezababavegifel.pdf
    • https://cdn.shopify.com/s/files/1/0432/8855/9782/files/60153963171.pdf
    • https://cdn.shopify.com/s/files/1/0464/1502/0200/files/wiwewirinejapixiwagiku.pdf
    • https://cdn.shopify.com/s/files/1/0434/6042/7928/files/wogodizebuzugudavikosid.pdf
    • https://cdn.shopify.com/s/files/1/0432/5005/7373/files/11269258117.pdf
    • https://cdn.shopify.com/s/files/1/0441/0497/4488/files/71715151739.pdf
    • https://cdn.shopify.com/s/files/1/0436/8692/0347/files/19959209885.pdf
    • https://static.usrfiles.com/ugd/9b33c5_622daaf841db455685e02fcfe2a0788d.pdf
    • https://static.usrfiles.com/ugd/b50c55_2f11afd2644d4fe7bfb39b8ac8546864.pdf
    • https://static.usrfiles.com/ugd/b8c837_07d0322f946144df9bb4b7ac129bc082.pdf
    • https://cdn.shopify.com/s/files/1/0429/2873/4367/files/2168714317.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/vevuvadafun.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_off000061fa.bin
b456d6cdafb4e6f0993dffa4f14138067eeb153015afebeec350f683501edce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61FA 5340 bytes
font_01_sfnt_off0000743d.bin
0cbe0632b35ffc8ca340a76e5681d80ce9a975d3e9899c82ab526a55d067e768		 pdf-font-stream PDF embedded font (sfnt) at offset 0x743D 11472 bytes

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