Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59d2c237b21964f…

MALICIOUS

PDF

51.4 KB Created: 2020-08-30 03:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 655c22209fbd760b0bf5353c54b36aae SHA-1: f1eb71a86915fa56ccbc9b4e8315fe929d788276 SHA-256: f59d2c237b21964f1d12f633851ecebed350e1e03dcf3ad78dcd38b4ec91108e
120 Risk Score

Malware Insights

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

The PDF file contains numerous links, with one critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'the ugly duckling short story pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The presence of multiple links hosted on cdn.shopify.com, even if some are confirmed benign, indicates a link farm strategy. 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.link/wix?keyword=the+ugly+duckling+short+story+pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/fokisonoxojagavujetewavu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2957/6352/files/netoxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/pujazutumoverososepez.pdf
    • https://cdn.shopify.com/s/files/1/0435/4496/9367/files/32855673301.pdf
    • https://cdn.shopify.com/s/files/1/0433/3810/5000/files/57610153966.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/hip_hop_artist_profile.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/kadosugemik.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/78011543036.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/aunt_uncle_cousin_worksheet.pdf
    • https://static.usrfiles.com/ugd/8de238_81b559e990e247078cd31c2bedbc230a.pdf
    • https://static.usrfiles.com/ugd/b8c837_57804bc5561047be90fab33181efb483.pdf
    • https://static.usrfiles.com/ugd/271e65_b2e5de2f6e1d4b12bf4910c189f3c4a6.pdf
    • https://static.usrfiles.com/ugd/09c3c7_dbb5cdabaa3946819331d716b4ef28b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_73c3feb5774a4625a0513c9c1c281488.pdf
    • https://static.usrfiles.com/ugd/49be48_549ba920658e4e67b5377efaeaf08f4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a76cb41a89294e1ebad1e8a4502a6ebb.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_off00008d4d.bin
b94aaedb6c3b7e5b467a75b5dadac4931001c0ff582fdd40c7a6f205c2399e56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4D 5320 bytes
font_01_sfnt_off00009f68.bin
1491835ef688e4ef933262e135f71c15104b78c5f5a2fba7969c66f616375c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F68 9744 bytes

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