Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef51b7433e7272f…

MALICIOUS

PDF

41.6 KB Created: 2020-08-31 16:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c7053353533b43f0ea0dcd7d1a7dfc7 SHA-1: 7951fd44068faf626c29a828e7d546ca3383c512 SHA-256: 2ef51b7433e7272f0333d690b2fe191bb52ad7141041cad66f6f729993ffd65d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes the same URL, suggesting a social media marketing lure. The presence of numerous external PDF links further indicates a link farm designed to obscure the malicious destination. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=marketing+through+social+media+pdf
    • https://static.usrfiles.com/ugd/63022f_418741e29a164fdcb404afa126cef251.pdf
    • https://static.usrfiles.com/ugd/576447_832ede810cb84b3ea247bbd1471a0d82.pdf
    • https://static.usrfiles.com/ugd/b8c837_8de2c3f5a3e14d688bca221f8f91ed6d.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2894/files/bonudasonigiwosenolugox.pdf
    • https://cdn.shopify.com/s/files/1/0440/7872/7318/files/furosemide_stress_test.pdf
    • https://static.usrfiles.com/ugd/b8c837_6de06d3b573048e3a1efb3c1268c79d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_9babca9598b14045ad3889e6a2fec3ae.pdf
    • https://static.usrfiles.com/ugd/429b25_d5606e4bc6fd49cf9d78c5d914cd2a0e.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20785775646.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2536/files/bejimaji.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_off00006382.bin
ac3e3781c9cc436af6eadd950aa2582bced7e90a0d3551cb07c478d772143032		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6382 5640 bytes
font_01_sfnt_off00007697.bin
4ce49bb8839851d08cf881239e719258f7cdfb6f564b87974e496f674ac252e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7697 10424 bytes

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