Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a15b0a262fbf295…

MALICIOUS

PDF

39.9 KB Created: 2020-08-29 17:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcc01d8f782f0f3234d9c3050ebb201e SHA-1: 8f422f7942237e7370b0baf27932ec975ff1268a SHA-256: 5a15b0a262fbf295a20d4a32cf96c116e39ec12ca5ecb6635135a320624a4831
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, pointing to 'https://ttraff.ru/wix?keyword=metodos+de+depreciacion+pdf'. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a tactic to broaden reach or obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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.ru/wix?keyword=metodos+de+depreciacion+pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38655606666.pdf
    • https://cdn.shopify.com/s/files/1/0429/3410/8323/files/fuduxanivazukekepadiri.pdf
    • https://cdn.shopify.com/s/files/1/0434/1130/8696/files/fanupipogelavirarow.pdf
    • https://static.usrfiles.com/ugd/271e65_c0ff05e09d7c400cab6b1d01fe7deb50.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa95854cc88841c696f29247252cd6fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_a054bf630dbb487b9970bd36e6cc5104.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_f2573ff2b526451199d1aeecfb1c6d5a.pdf
    • https://static.usrfiles.com/ugd/b8c837_c773afb0a1c040b3abcb07471c7f7c08.pdf
    • https://static.usrfiles.com/ugd/2f8cea_6a92011882e84cb9bbaec7ff9361ce08.pdf
    • https://static.usrfiles.com/ugd/b8c837_81b87fe516dd48da9ca8c03f5954dd05.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_off00005aca.bin
c332839e3a77349ad865f80c14e684ef965dfe6db9e0e1127ca5405860ea8fa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ACA 5120 bytes
font_01_sfnt_off00006c52.bin
64ae2e751eb223d5d09223fe111ef29d488b5364aeec41919448b01e28f34e7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C52 11708 bytes

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