Malicious PDF — malware analysis report

Static analysis result for SHA-256 286b166fe4df8d77…

MALICIOUS

PDF

41.1 KB Created: 2020-09-02 16:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8034ef6b9374ad7d66ffa22177f27027 SHA-1: 2d14faec91a62cf0aba6a842a1d7f53fe787d9b9 SHA-256: 286b166fe4df8d77b605a6181ea6da9a241bce071f6663b1931f5ed677294c9d
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, pointing to `https://ttraff.club/wix?keyword=primary+mathematics+3a+textbook+pdf`. This URL is embedded within the document body, disguised as a textbook PDF. The PDF also exhibits characteristics of a link farm, with numerous external links, many of which point to benign Shopify domains, likely as a camouflage or SEO manipulation tactic. The primary malicious URL 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.club/wix?keyword=primary+mathematics+3a+textbook+pdf
    • https://static.usrfiles.com/ugd/a2d007_01a948996817480db6364cd66182e158.pdf
    • https://static.usrfiles.com/ugd/74a852_77282fed288949f9b3191c4c061d4958.pdf
    • https://static.usrfiles.com/ugd/3b47cb_6368898fe852409ba7d6aed0815716cc.pdf
    • https://static.usrfiles.com/ugd/1cc777_f8998161a4f240689bbf02515cf09cb6.pdf
    • https://cdn.shopify.com/s/files/1/0433/9115/6380/files/bapajavobibemixiganibibem.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/zujesagawadazubepebira.pdf
    • https://cdn.shopify.com/s/files/1/0450/8113/3219/files/92519101932.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7592/files/cav_injection_pump.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nexunalazuzifoginiwaboliz.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6651/files/tofixaleduropopiminelixu.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_off000060cf.bin
7b25c63a972c6923ab5dc7107e8fbbabba6f27599265618f0cc751519c7cb8a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60CF 5904 bytes
font_01_sfnt_off000074c4.bin
fb686a0f9f023f818a798f635419d4bb61e493a319f42e35ddbb9941c65b87f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C4 10656 bytes

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