Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8595b850a462de…

MALICIOUS

PDF

43.5 KB Created: 2020-08-08 22:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b015ffaddf73a92c6e41f4025b169c90 SHA-1: 76625abc44a2b63401ad820995aa02ecf525e269 SHA-256: 8e8595b850a462de42cafd572762c32f4a89f87cb62f43cba4335656a918302c
150 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 also present in the document body. The document body text, though partially corrupted, indicates a lure related to 'debit voucher format pdf'. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=debit+voucher+format+pdf
    • http://ririsutes.rockyouthministry.com/uploads/1/3/0/7/130776485/ralibobozemerezusa.pdf
    • http://files.hd-crafts.com/uploads/1/3/1/0/131070207/64caea4c1b4.pdf
    • http://files.spittpassion.com/uploads/1/3/1/8/131871518/4c4ff.pdf
    • https://cdn.shopify.com/s/files/1/0430/3549/2503/files/9376502656.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76410179135.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5626/files/tuvapotenatazafeka.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9815/files/surolatepuso.pdf
    • https://cdn.shopify.com/s/files/1/0436/2344/8736/files/27588602341.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/vivezoxaxuvowukemawuzi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6389/2376/files/76343293233.pdf
    • https://cdn.shopify.com/s/files/1/0433/8817/4497/files/71265085890.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/38865438518.pdf
    • https://cdn.shopify.com/s/files/1/0428/4658/4999/files/gubumifogilopo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9717/0847/files/nolezogi.pdf
    • https://cdn.shopify.com/s/files/1/0427/5542/4423/files/83608107334.pdf
    • https://cdn.shopify.com/s/files/1/0432/2285/9944/files/xelamowuponuji.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/74071721627.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_off00006b76.bin
469a48676c20531fe5b2468995913794c98614824b29eb2523752d1ff53ca328		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B76 5384 bytes
font_01_sfnt_off00007da3.bin
ab1e8514f345a82235217e94b5c8d082f9ea982ad87a97675a765246f1f33bc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA3 10472 bytes

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