Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43a95583dbd0e40…

MALICIOUS

PDF

38.5 KB Created: 2020-08-02 16:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5141c21558ade29f59115a50cd33aca1 SHA-1: a5fa49cce6aa3b6ef8636f2999ca8f731c5f03fc SHA-256: e43a95583dbd0e40e487645753a7984827ae961ab4b6ac8ed4eac5af0045aa17
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.com/pify?keyword=matlab+5th+edition+pdf'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL and references 'Matlab 5th edition pdf', suggesting a lure to entice users to click the malicious link.

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.com/pify?keyword=matlab+5th+edition+pdf
    • http://files.thecuriousunicorn.com/uploads/1/3/1/8/131871556/bilefonamupipaw_liniva_naboroj_mutibonumaxaxu.pdf
    • http://files.monikamdesign.net/uploads/1/3/1/0/131070911/7a76778ec90dd44.pdf
    • http://files.valleyhuntervizslas.com/uploads/1/3/1/6/131606951/2640673.pdf
    • http://files.cairngormsnaturalburials.co.uk/uploads/1/3/2/7/132741169/6567323.pdf
    • https://cdn.shopify.com/s/files/1/0429/1988/7001/files/vitoxegopinolalikusuvuvit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pegumi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6930/8061/files/18465072166.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/11006794377.pdf
    • https://cdn.shopify.com/s/files/1/0430/2848/0157/files/saveraza.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/kitisogevuzajidibugil.pdf
    • https://cdn.shopify.com/s/files/1/0437/3030/5178/files/lerikipupigotup.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/93773516454.pdf
    • https://cdn.shopify.com/s/files/1/0431/4074/3330/files/suzasamexu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/vixegarapafomunisuj.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_off00005728.bin
72402a821ef72c48b30ffa8571fd903b53b991d8377336f53cb9d4a91a586990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5728 5124 bytes
font_01_sfnt_off000068a0.bin
bce8b52a8e8a7359c0996175ae794102d6f72f68b29aff786171933fda21cb73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A0 10504 bytes

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