Malicious PDF — malware analysis report

Static analysis result for SHA-256 20106b8e5ebfff01…

MALICIOUS

PDF

39.4 KB Created: 2020-08-01 19:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61459280433adfcfc4666d5f23b5c9e1 SHA-1: 08bbb4c31636450869f3281cc213afa3d7f7d96e SHA-256: 20106b8e5ebfff01eb1ae41603b6f44d493068a7a96ac4c7563e45616cfa34ce
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains text related to 'Vizio tv codes for directv remotes', aligning with the SEO lure. The file was generated using wkhtmltopdf, a tool often abused for creating malicious PDFs.

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.ru/pify?keyword=vizio+tv+codes+for+directv+remotes
    • http://files.supwirral.club/uploads/1/3/1/1/131164556/xirirevawovom_jufofuke_dapanil.pdf
    • http://files.troop109bonita.com/uploads/1/3/2/6/132680986/8059129.pdf
    • http://files.truewealthfg.com/uploads/1/3/2/7/132710687/migejowo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9115/5361/files/gamogipuvip.pdf
    • https://cdn.shopify.com/s/files/1/0438/1537/0912/files/kigeso.pdf
    • https://cdn.shopify.com/s/files/1/0432/1578/2048/files/visaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23631451812.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7962/files/refow.pdf
    • https://cdn.shopify.com/s/files/1/0428/5035/3318/files/4736693735.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/42888191210.pdf
    • https://cdn.shopify.com/s/files/1/0437/7985/0398/files/69531943445.pdf
    • https://cdn.shopify.com/s/files/1/0429/6169/8969/files/40988954252.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/88873140954.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8404/files/gawusiniju.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8664/files/zexipa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/kavujapekede.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4734/files/38039524805.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_off00005df8.bin
1acbf0947581248675daa2cdc08818d381287dfe55627c6e241abab5375645c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF8 5000 bytes
font_01_sfnt_off00006efe.bin
7ec8da915a94f4ba076c606924b54873088dd97e616c7de65d2d3fa17bb259f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFE 9944 bytes

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