Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c945c6baeebce8…

MALICIOUS

PDF

41.5 KB Created: 2020-08-28 22:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d1e7f5486631ba4cefa321481ffe670 SHA-1: ab8503e05ab2ec1ddb497ac3dbf6948897376487 SHA-256: 41c945c6baeebce874018e812a6bba916aae0a303702dc6bbdeca48393a58026
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=assurance+wireless+voicemail+app+download'. This URL is presented within the document body, disguised as a legitimate application download. The PDF also contains a heuristic for a link farm, with numerous external links, many hosted on Shopify. The primary malicious link is the most critical IOC.

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=assurance+wireless+voicemail+app+download
    • https://cdn.shopify.com/s/files/1/0435/8399/6063/files/adblock_for_stock_android_browser.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/64813203277.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/unilorin_2nd_batch_admission_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/luwivuva.pdf
    • https://static.usrfiles.com/ugd/b8c837_92d2526c93cb496e9193eaea4a828be4.pdf
    • https://static.usrfiles.com/ugd/b8c837_b58bd7371b9e4bb192edae163889cf27.pdf
    • https://static.usrfiles.com/ugd/b8c837_c501d8fa13944c5da4245ccb5664cdc9.pdf
    • https://static.usrfiles.com/ugd/b8c837_f49eabad86f048a197efaeb994fdb866.pdf
    • https://static.usrfiles.com/ugd/b8c837_d17db36ffd7a4e5c8cbb7c4f97faa918.pdf
    • https://cdn.shopify.com/s/files/1/0428/3862/2375/files/erotik_kala_masaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/7008/7587/files/74920690882.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_off000063cc.bin
b5026590c064d360e507a3614f3c387e20701939e578a2c7f7ea0fb713cd10b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63CC 5360 bytes
font_01_sfnt_off00007600.bin
f920cb63b936bdeebcec5166aeb4a45522ca8840724564b2215eb124fcc22148		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7600 10300 bytes

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