Malicious PDF — malware analysis report

Static analysis result for SHA-256 a480db2243551b7e…

MALICIOUS

PDF

43.0 KB Created: 2020-08-31 20:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9f77e09361dfae5afc5906bdc3f11ef SHA-1: 9487d660b411912b5c8016fbe2282447ad74ac41 SHA-256: a480db2243551b7e23f5bd80f6b8341f3115e4ced76e1394827dc24a26131f0d
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a 'weekly budget planner template excel' and the malicious URL. The presence of numerous external PDF links, many pointing to static.usrfiles.com, suggests a link farm designed to obscure the ultimate destination and potentially improve search engine ranking for malicious content. The primary malicious IOC is the redirector URL.

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/pify?keyword=weekly+budget+planner+template+excel
    • https://static.usrfiles.com/ugd/09273f_96c1583926f0415f9d369ff097508f8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_82bde895ce6f40999d80045b31ea7c76.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb47b5f1d4014dbdb96ac6e2fda0fb45.pdf
    • https://static.usrfiles.com/ugd/f55bec_151d07c3a70c4916a719db636782d4f1.pdf
    • https://static.usrfiles.com/ugd/909b15_e712a238b9be463aae94858af62be1cb.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_457bb54e4ece4ede9d64b9ca9f1c28cd.pdf
    • https://static.usrfiles.com/ugd/5ecadc_051ecd019ea340158d4ef7bebc267c59.pdf
    • https://cdn.shopify.com/s/files/1/0437/1359/3499/files/teoria_del_centesimo_mono.pdf
    • https://cdn.shopify.com/s/files/1/0463/4869/7757/files/duwujagomubivopimakazalo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/92511547410.pdf
    • https://cdn.shopify.com/s/files/1/0434/7143/7984/files/41957952324.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/tadano_atf_220g_5.pdf
    • https://cdn.shopify.com/s/files/1/0429/5727/5299/files/65603755154.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_off00006a12.bin
311efbd77342125741a3dca744eb284404281ee1ade5561a736755dbaf055ee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A12 5604 bytes
font_01_sfnt_off00007d30.bin
370a63458a651ebaa8ec61f9e42812ef67208b48545b42bb82a30ea2922dd78c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D30 9980 bytes

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