Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6ce35aea07c510…

MALICIOUS

PDF

37.6 KB Created: 2020-08-31 11:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab2c0709de777b3ad48e0d6a82802b6c SHA-1: b55ee2eeb722a9099ab56294b2f84ef052586dac SHA-256: 4f6ce35aea07c51047640bf2eb8c2ed8807feb147a7705b51dae4d877c5af8f8
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, pointing to ttraff.com. This indicates an attempt to lure users to malicious infrastructure. The document body, though heavily obfuscated, also contains the same URL, reinforcing the malicious intent. The presence of a large number of external PDF links, many pointing to benign content, suggests a link farm or SEO poisoning tactic to mask the malicious redirector.

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.com/wix?keyword=adding+subtracting+and+multiplying+polynomials+worksheet
    • https://static.usrfiles.com/ugd/804ff6_028e08b8c4604cf8b2f50ec02338e618.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa054a5fcd264abc984fea4c92328c5f.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_5661a3d678734380bd5e88d06f40d0c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_126fc4e8036b4a018433c4911e9352bf.pdf
    • https://static.usrfiles.com/ugd/921909_97264d9cc641497aa72f58bdc8ff2e21.pdf
    • https://static.usrfiles.com/ugd/45fd81_ae8267399cea46b3bb6338ba88e80cbc.pdf
    • https://cdn.shopify.com/s/files/1/0453/5540/1371/files/boolean_search_strings.pdf
    • https://cdn.shopify.com/s/files/1/0431/5516/1252/files/nemazipifowagegiwix.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/10077306954.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0269/files/16189665790.pdf
    • https://cdn.shopify.com/s/files/1/0464/5231/0184/files/dufirodu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8280/9508/files/free_scholarship_essay_templates.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_off00005400.bin
ebdee236ccd1a219ad7c6c7e7b93561188e0cf10785d3608303929ff22288e89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5400 5876 bytes
font_01_sfnt_off000067dc.bin
0035c3a001010ed429678300becba6d4b642cc1d81500e3529450c040d09f83d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DC 9824 bytes

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