Malicious PDF — malware analysis report

Static analysis result for SHA-256 50235b3d8b34ad63…

MALICIOUS

PDF

36.7 KB Created: 2020-07-29 05:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71cade8fefb16052811d98f43ff2549a SHA-1: 481e503d3308910a9aa443f21abf30e598d1a26b SHA-256: 50235b3d8b34ad63ed0d60474f2138a67b887c2d78eac510f74f5cb0502e9a6f
120 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 the primary mechanism for luring victims. It also exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains. The document body, though heavily obfuscated, contains text related to 'piano sheet music' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The primary IOC is the malicious 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/pify?keyword=million+dreams+piano+sheet+music+pdf+free
    • http://files.bamboolearners.com/uploads/1/3/1/6/131606256/b9d05f0b185252.pdf
    • http://files.allisoncamerongray.com/uploads/1/3/0/9/130969172/fegebibadivak.pdf
    • http://files.forkstudios.com/uploads/1/3/1/3/131380345/xutixuruvu_pulifeliguloki.pdf
    • http://files.forkstudios.com/uploads/1/3/1/3/131380345/xut
    • https://cdn.shopify.com/s/files/1/0435/8438/9275/files/kuwabitexifofu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97897646990.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/28196009136.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12247178291.pdf
    • https://cdn.shopify.com/s/files/1/0437/1454/3771/files/59845904992.pdf
    • https://cdn.shopify.com/s/files/1/0427/8868/3932/files/64950146412.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/pasujit.pdf
    • https://cdn.shopify.com/s/files/1/0431/1678/9927/files/puzuwojiwifativoxovalemed.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/zetuwik.pdf
    • https://cdn.shopify.com/s/files/1/0437/1913/1285/files/gotafapi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6579/2929/files/dixuzo.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_off0000544e.bin
2ff4910da6bf127472a8da45f9d2118bab4b201d99cf962110c5ca55850d2f31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x544E 5280 bytes
font_01_sfnt_off00006614.bin
e8eac5874e7c0c934d11f281347860333cad70ca686abd93b6219be253c0de26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6614 9240 bytes

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