Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e653acad602d6f…

MALICIOUS

PDF

50.3 KB Created: 2020-07-26 10:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 927cc1d28817e6bdbe9973b5958356aa SHA-1: d0bc1f1720eee2df8ef2115f00049cc8ffd20a83 SHA-256: c5e653acad602d6f789a97a37f6046596e947c43c4711daf949fcb49fa6d6ac6
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to a known malicious redirector. Additionally, the PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external PDF links, many hosted on cdn.shopify.com, which are likely part of a link farm. The primary malicious URL identified is ttraff.cc, which is used to redirect users. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

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=assessing+listening+and+speaking+skills+pdf
    • http://files.lakelouisebiblestudy.com/uploads/1/3/2/6/132696267/420322.pdf
    • http://files.gottatinkle.com/uploads/1/3/0/8/130813095/wudomozuxabugozazuv.pdf
    • http://files.legolasgoldens.com/uploads/1/3/1/3/131380308/sirusatuxedara-wuzubu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7352/files/43913415458.pdf
    • https://cdn.shopify.com/s/files/1/0430/8962/5241/files/wepofumuresoxeg.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3738/files/85314527607.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8073/files/tilofawuxisixaxekopifax.pdf
    • https://cdn.shopify.com/s/files/1/0431/3684/3933/files/wonupinowipuwudopevuxenon.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6557/files/nakuwasibesekiwefusibe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0657/files/gejizajulowuso.pdf
    • https://cdn.shopify.com/s/files/1/0433/6920/1832/files/76418378764.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/xupinijixokefi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5142/files/46767718867.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9730/files/99782356418.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/
    • https://cdn.shopify.com/s/files/1/04

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088cb.bin
58e04d5a8e5cb413879644563a287871d1efb3b0340e22c3d6013a4ea41993fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88CB 4844 bytes
font_01_sfnt_off0000994f.bin
2ec957f2b7d081608f75f6f95cca9ef3ca32fcf1908bb8bc1faf3c757e5dd83e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x994F 10148 bytes

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