Malicious PDF — malware analysis report

Static analysis result for SHA-256 498945b0190bf7fe…

MALICIOUS

PDF

33.2 KB Created: 2020-08-16 23:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 173cc46e33de800f79514b64ea816d7b SHA-1: 5b8cf89bb08786e03d94f30786dd4f98ae761c80 SHA-256: 498945b0190bf7fe122a1db79786485330cb56e125ae1abb8f3d47f119e43b65
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic identifying a redirector to known malicious infrastructure. Another heuristic indicates a link farm hosted on Shopify, suggesting an attempt to distribute malicious content or lure users to phishing sites. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=national+infection+control+guidelines+2019
    • http://semevajam.mooremeats.com/uploads/1/3/1/4/131407406/10578af.pdf
    • https://cdn.shopify.com/s/files/1/0433/7208/5406/files/borodudajolituti.pdf
    • https://cdn.shopify.com/s/files/1/0431/8252/2528/files/overwatch_failed_to_connect_to_server.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3358/files/gunozupipoxawunejafix.pdf
    • https://cdn.shopify.com/s/files/1/0431/3278/0701/files/bivariate_normal.pdf
    • https://cdn.shopify.com/s/files/1/0432/0369/0660/files/anatomy_of_human_body_parts.pdf
    • https://cdn.shopify.com/s/files/1/0444/7849/6935/files/cerita_sejarah_bandung_lautan_api.pdf
    • https://cdn.shopify.com/s/files/1/0434/5859/2921/files/96897135875.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gojifazuxosupimuron.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/kodomoluzuku.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5710/files/eureka_edgar_allan_poe_gratis.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_off00004542.bin
536a64d7720abd516def9975b74680ca41115721f94e1dbfc9d5540e6b51bc4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4542 5640 bytes
font_01_sfnt_off00005882.bin
fa6bb6a11e42e85d076f888d543dce0a8b170aff28efac8cd95b0fcea7139956		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5882 9284 bytes

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