Malicious PDF — malware analysis report

Static analysis result for SHA-256 69ed40ed4fdc129b…

MALICIOUS

PDF

47.1 KB Created: 2020-08-14 22:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ae3c57b6d33138aa2992c888f561712 SHA-1: cef1bfc2cf1301a91aa92d2a92d9294b8024fc8b SHA-256: 69ed40ed4fdc129b22f1122de8c7cf54777b8265d7d5fa628d4d34a4ffd19c10
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure suggesting the user needs to install a browser extension or update to view content, which is a common social-engineering tactic. It also contains a link to a known malicious redirector, https://ttraff.com/pify?keyword=file+to+pdf+merge, which likely serves as a gateway to further malicious activity. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.com/pify?keyword=file+to+pdf+merge
    • http://files.acas.us/uploads/1/3/0/7/130739369/kopovirawomirodove.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/16637860613.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8246/files/jegunagobefupojetexe.pdf
    • https://cdn.shopify.com/s/files/1/0440/6122/9206/files/thermo_scientific_cdna_synthesis_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/gavasivudabexapirasefi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8072/files/eros_san_franciso.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/8th_grade_math_coloring_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/5278/5055/files/nopegukolinur.pdf
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/konobovin.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/ligonujudomilas.pdf
    • https://cdn.shopify.com/s/files/1/0432/0519/7985/files/sewigi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/19211119130.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/
    • http://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00006969.bin
77add668a77fe2d57cfa15becbbdcbbdb9635cd7a168672b2f09fb4060f19162		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6969 10212 bytes
font_00_sfnt_off000058bb.bin
dea3a0009b98a9ea198fe1eed60cacf38bbcb2d87f4082f5025d4038d4f6fa46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58BB 4928 bytes
font_02_sfnt_off00008628.bin
d3a7ab50e6bd4b8f50339ffb5c7f731b0148d584411c9bea55c2a0db773a7083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8628 12952 bytes

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