Malicious PDF — malware analysis report

Static analysis result for SHA-256 57655aba34cf0a63…

MALICIOUS

PDF

41.8 KB Created: 2020-08-24 10:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 658252f0d4b1047c28dda830b0b352bd SHA-1: 187505b55df2559fb4b1014edb80dd996f4cd0e3 SHA-256: 57655aba34cf0a6306de753e48634890f3c37b822e3a11e7f7e1a96ebc8d2464
120 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=ecatts+test+answers'. This suggests a phishing or scam attempt, aiming to direct users to malicious content. The document body text, though heavily obfuscated, contains the string 'ecatts test answers', reinforcing the lure. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to improve search engine ranking for malicious content.

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=ecatts+test+answers
    • http://files.tcnighttoshine.com/uploads/1/3/1/8/131857920/2590958.pdf
    • https://cdn.shopify.com/s/files/1/0430/8667/6117/files/lit_to.pdf
    • https://cdn.shopify.com/s/files/1/0434/7183/1193/files/nifogugigisadabol.pdf
    • https://cdn.shopify.com/s/files/1/0438/2556/1757/files/eritema_toxico_en_el_recien_nacido.pdf
    • https://cdn.shopify.com/s/files/1/0432/1188/2653/files/64591207711.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/ielts_semi_formal_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/1633/1172/files/37416313472.pdf
    • https://cdn.shopify.com/s/files/1/0427/5824/2470/files/59046476187.pdf
    • https://cdn.shopify.com/s/files/1/0435/9982/3016/files/83139801425.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_off00005a35.bin
332503f8135e5383035af52e647584ba10aac29a7245d68ba15d359a4b0d8a8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A35 4808 bytes
font_01_sfnt_off00006aaa.bin
47ae3b94fc20f92df9a8568890df21aa5d60beb6bc4633b74b7c75ffd39b5d2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAA 15976 bytes

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