Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a45dd4982d0378…

MALICIOUS

PDF

60.6 KB Created: 2020-09-11 09:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cd230fcb44287fadaa34e4571f879b3 SHA-1: ffd652ab0187856eec6d9ff8c6331783814255a9 SHA-256: 91a45dd4982d0378db2d145e94e0c43364ac89d823b884e219f39b076edeb35d
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The document body, though heavily obfuscated, contains the malicious URL. The file also contains a large number of embedded links, many pointing to static.usrfiles.com, which is flagged as a link farm.

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.link/wix?keyword=windows+10+1703+language+pack+offline
    • https://static.usrfiles.com/ugd/4cfbbd_d29e24d9200a4e7c9e333b0ff56eda9f.pdf
    • https://static.usrfiles.com/ugd/96768c_d47e5a8558e44921b1be4a703b2944f8.pdf
    • https://static.usrfiles.com/ugd/5ecadc_fdff521b882b4515a892a52978583ab3.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/16456042618.pdf
    • https://cdn.shopify.com/s/files/1/0427/5562/1031/files/66394585686.pdf
    • https://cdn.shopify.com/s/files/1/0430/9093/5969/files/want_you_gone_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0429/7090/6780/files/dowuninesi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96617946950.pdf
    • https://static.usrfiles.com/ugd/8a9bcc_1336ed6ee60048c7864199a425a3b8d1.pdf
    • https://static.usrfiles.com/ugd/33c377_2e3f6af0ec6b4c389c027300c8acd9f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_1353e6e07bad48c5b2d358914f14a1f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_80c09b72ba0a440abe4c978e1794a1c5.pdf
    • https://static.usrfiles.com/ugd/65d6f7_380ff0af8b2e44329d3e3d811b13043c.pdf
    • https://cdn.shopify.com/s/files/1/0438/6239/2992/files/barefoot_investor_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3895/files/62723733382.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/71929234394.pdf
    • https://cdn.shopify.com/s/files/1/0431/8229/3152/files/jenizulufagapadewem.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/wasibilaxoraladuteroxavud.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_off00008667.bin
3ae7f762dfbc2c733d830d036a90de502e85686a617b9edc768ff8d1b1aafafd
pdf-font-stream PDF embedded font (sfnt) at offset 0x8667 5836 bytes
font_01_sfnt_off00009a8b.bin
d2b157e260bc455a6558d9a1c49f95f37fabd27c409a93d2aef9b2772a9f4863
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A8B 16948 bytes
font_02_sfnt_off0000cf6c.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6C 16204 bytes