Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52b5ed6b68fb91f…

MALICIOUS

PDF

46.6 KB Created: 2020-08-31 12:39:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02956ceb7ceb3cc183ac355913b5004c SHA-1: 9f06aa1150e799dad5d0d9ea911bae0a4457a9ad SHA-256: e52b5ed6b68fb91fce12fd65f13e25456dc0ddde5dbf31567106c59826f65429
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm. One of the primary links directs to 'ttraff.ru', a known malicious redirector. The document body, though heavily obfuscated, contains this URL and other Shopify-hosted PDF links. The ML classifier also strongly indicated maliciousness.

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.ru/wix?keyword=bretta+hollow+knight
    • https://cdn.shopify.com/s/files/1/0430/7048/8730/files/7_blnebilme_kural.pdf
    • https://cdn.shopify.com/s/files/1/0435/9074/6271/files/factorio_12_to_8_balancer.pdf
    • https://cdn.shopify.com/s/files/1/0429/3433/7695/files/63267199770.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/88349579156.pdf
    • https://cdn.shopify.com/s/files/1/0431/0266/6914/files/82720841719.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ae88f32c82d4561a969baeaeb101fa2.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2cde38818a04cc583ac053270201db2.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ab2000b8d6042e19db345e48f2bcbda.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_664b35aaba6940f6a9cc43c8ad7c8b4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_89c8ccee109b40e9ad89d3b19b6d3d23.pdf
    • https://static.usrfiles.com/ugd/8de238_f7138a9516a44450be8f9401f5a95120.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e721ad7b5454fb48fa1b5ac54405ad1.pdf
    • https://cdn.shopify.com/s/files/1/0429/0835/2679/files/satozogotejekanifopitov.pdf
    • https://cdn.shopify.com/s/files/1/0429/4492/1766/files/93856135494.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/paxotaxazojulilinitulo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/86051973337.pdf
    • https://cdn.shopify.com/s/files/1/0435/3431/9776/files/34128280629.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d4f.bin
6c5690a8b9e0ff1cf6107703adcb450a02405efd6710c09fff36bd1446909bb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4F 4760 bytes
font_01_sfnt_off00007d7e.bin
aa916ba390c2fb366f50b38f38f7ce5af1684739bc5219c46f4c13cac0bb070a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D7E 10044 bytes
font_02_sfnt_off00009fc3.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FC3 4324 bytes