Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31915420e05f899…

MALICIOUS

PDF

35.1 KB Created: 2020-08-16 23:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e501c82eeb7f9914387d06d56b828e3 SHA-1: abd40ca6b547f8aeff431d679f4ef50a8a552fbc SHA-256: d31915420e05f899bebe2c0e196fb27f4c694ce4520a435e12f4307d8a5bbdc5
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to a URL that includes 'promissory note extension agreement form' in its query parameters. This suggests a phishing or scam attempt. The document body, though partially corrupted, also contains this URL and numerous other links hosted on Shopify, likely part of a link farm to obscure the malicious redirector. The primary malicious IOC is the ttraff.ru redirector.

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=promissory+note+extension+agreement+form
    • http://diwuxikid.camdenspeedwaytn.com/uploads/1/3/1/1/131164066/143da60.pdf
    • https://cdn.shopify.com/s/files/1/0428/0372/4455/files/40532730035.pdf
    • https://cdn.shopify.com/s/files/1/0434/5672/5153/files/nusazipunorap.pdf
    • https://cdn.shopify.com/s/files/1/0430/1612/6625/files/53970913441.pdf
    • https://cdn.shopify.com/s/files/1/0435/3120/6808/files/ropupinogavapes.pdf
    • https://cdn.shopify.com/s/files/1/0438/9719/2603/files/ssc_je_admit_card_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2423/6199/files/67895369408.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/59507559978.pdf
    • https://cdn.shopify.com/s/files/1/0451/0639/7337/files/54522337682.pdf
    • https://cdn.shopify.com/s/files/1/0435/0004/4454/files/test_credit_card_numbers_stripe.pdf
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/54700132767.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_off00004aed.bin
b1e1599b581894683e9845db27918f0e7875d6c22c2e624d5edfcb3cc7bcd997		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AED 5228 bytes
font_01_sfnt_off00005ca9.bin
ed5431d02b964e9e3bf2147478a45893930306b65cb67a09192b7ddc7791a1a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA9 10212 bytes

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