Malicious PDF — malware analysis report

Static analysis result for SHA-256 434d874f04fb7f07…

MALICIOUS

PDF

41.7 KB Created: 2020-08-29 23:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45506fde0dbf5204b7a0802fc874b477 SHA-1: 31118b10130316cb47912836f51d4ac3a9fd46c0 SHA-256: 434d874f04fb7f07c78f1cea992e5e49b0e742a64880f9c6eaaa32ebf4c38e98
120 Risk Score

Malware Insights

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

The PDF document contains a link that redirects to a known malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to 'nursing pharmacology 8th ed'. The PDF also contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, which are likely part of a link farm to improve search engine ranking for malicious content. The primary malicious IOC is the redirector URL.

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.cc/wix?keyword=focus+on+nursing+pharmacology+8th+ed
    • https://static.usrfiles.com/ugd/b8c837_ec75e064e67140e6a819ade02fb77d06.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c8b2143903642f8994781e8bcc85afc.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cad664b32c740599c559bfef1fdb2b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b686685de604f7a9cf67d3588a41c96.pdf
    • https://static.usrfiles.com/ugd/b8c837_f166e2c1d215496f9fdefdc1a5be1c93.pdf
    • https://static.usrfiles.com/ugd/b8c837_11db2222ef77485abd0fab85b8fdd4a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2a64e9ec32d43a7ada7c7ae41efe6a7.pdf
    • https://static.usrfiles.com/ugd/69695d_9c1b3dffa3c34c4893f725b834dc6fa0.pdf
    • https://cdn.shopify.com/s/files/1/0431/5342/4540/files/10393565288.pdf
    • https://cdn.shopify.com/s/files/1/0462/7827/9317/files/xivewazivob.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2337/files/72387026578.pdf
    • https://cdn.shopify.com/s/files/1/0446/5954/0121/files/49935663224.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6502/files/zejal.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/85322734801.pdf
    • https://cdn.shopify.com/s/files/1/0428/6028/2023/files/bekukenovimiwebiwikeg.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_off000063da.bin
34583a8b18ed170120d292f0118c763fbef7433468cbf0acee02a3360e434bd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63DA 5740 bytes
font_01_sfnt_off00007737.bin
1e3ee84baf332952e4eb212acd606513838a69d754047127d24754ab814fe0b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7737 10132 bytes

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