Malicious PDF — malware analysis report

Static analysis result for SHA-256 803a402934a3a7bc…

MALICIOUS

PDF

35.5 KB Created: 2020-08-31 11:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbeb3b26b37e3883c7465a661eede864 SHA-1: ab1aff531b71ac1fe2ef8bd0ce841566f9c7e6cc SHA-256: 803a402934a3a7bc6ef5e5fab55fe80b41379e44b44c235431ff2f816fa2f160
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to a malicious URL, suggesting a phishing or malware distribution attempt. The document body, though heavily corrupted, contains text related to downloading a nursing book, which serves as a lure. The ML classifier strongly indicates maliciousness, and the PDF structure itself is flagged for containing numerous external links, likely for SEO manipulation to drive traffic to the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/wix?keyword=libro+de+enfermeria+nic+descargar+gratis
    • https://static.usrfiles.com/ugd/d902bb_95ccde33c92243078adf426dc5c6a995.pdf
    • https://static.usrfiles.com/ugd/96768c_944a2f9e4d7349e2b780fdc0a17fc3cd.pdf
    • https://static.usrfiles.com/ugd/1a89c8_bff91d6963c74c4e8e80850a44d15db3.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/95343359165.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb569ad354af49e2ba2fd11256c59033.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_fdd45b63875d449b96a84aaf1b6c8ad8.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4748/files/girebopup.pdf
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/the_economist_december_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/1961/6935/files/jaxak.pdf
    • https://cdn.shopify.com/s/files/1/0431/5119/6315/files/52769610667.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_off00004a1e.bin
5ab3ad5335cdf38ff6bd6a92199c3331c6972c08c949170c15a1202757ecae07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A1E 5388 bytes
font_01_sfnt_off00005c55.bin
9c4311d377d61030e0bb8b17ee41ceac015520d25104f66e6edc6438c7f71d91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C55 10908 bytes

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