Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b785ed8a843db4…

MALICIOUS

PDF

56.5 KB Created: 2020-07-31 03:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52eb8184ddf6a44bc4296dffe50bced5 SHA-1: af518e916bc2f76993a6355d1256e247a7f087c0 SHA-256: 31b785ed8a843db48f7757149ef3ee8f75722c9b73b149ca7a2b69445767774c
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to a known malicious URL. Additionally, PDF_SEO_LINK_FARM suggests the PDF is part of a link farm, likely for SEO manipulation or to distribute malicious links. The document body, though heavily obfuscated, contains text related to 'ketogenic diet recipes pdf free', serving as a lure. 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=ketogenic+diet+recipes+pdf+free
    • http://files.msumun.org/uploads/1/3/1/4/131408537/1f52dfa8d.pdf
    • http://files.spaceonetwoone.com/uploads/1/3/2/6/132680962/makipa.pdf
    • http://files.biblestudylife.com/uploads/1/3/1/6/131606248/414e62bf7.pdf
    • http://files.fallscreekcc.com/uploads/1/3/2/6/132695535/wifol.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/23049620916.pdf
    • https://cdn.shopify.com/s/files/1/0430/5905/2706/files/34388241562.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4630/files/66043759293.pdf
    • https://cdn.shopify.com/s/files/1/0436/2944/5273/files/luxak.pdf
    • https://cdn.shopify.com/s/files/1/0436/9265/4745/files/27244026431.pdf
    • https://cdn.shopify.com/s/files/1/0434/7789/3270/files/28349266118.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/fofuwonomibeles.pdf
    • https://cdn.shopify.com/s/files/1/0433/2702/9400/files/lexanuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/35900838225.pdf
    • https://cdn.shopify.com/s/files/1/0434/5312/0669/files/46435476704.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9363/files/vejadikolu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1500/4582/files/pefinifik.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/45840048651.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/1/0436/9265/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009fbc.bin
0db7dafa18509eacd3f2737c05e33eab6003441b0bb97a9497942fc468cc5a52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FBC 4836 bytes
font_01_sfnt_off0000b04d.bin
bac356461cac85537d22d7e0450050d458afad62edc1dcf1b70ec8985d63dd80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB04D 10644 bytes

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