Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e2427082ba728c…

MALICIOUS

PDF

44.4 KB Created: 2020-08-30 23:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cb249619ad68f6f26f24ac92473a9d1 SHA-1: cf8ceb885992f6bada8d25da498bd4d2619cb637 SHA-256: 15e2427082ba728cdae51273889830b4a95b8ab2988200e5dd3a7a75fb5f8fcf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs, suggesting a link farm or SEO manipulation tactic to distribute malware or phish users.

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=zara+orhan+gencebay+dilenci+indir
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/3b47cb_62147d974fff4e5588c9029199b0e457.pdf
    • https://static.usrfiles.com/ugd/9d66c7_48b2a0059133482081d04983c937a25d.pdf
    • https://static.usrfiles.com/ugd/1f2646_4a3ebdd8f8bb49de8753e6f05c0808bf.pdf
    • https://static.usrfiles.com/ugd/77eba6_50f3c5139c5c4a92a2e862bf6786384c.pdf
    • https://static.usrfiles.com/ugd/a107db_1864325d149442a5a71d60da7310165d.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_36d28eb2c20849efa8091a0da321b85c.pdf
    • https://static.usrfiles.com/ugd/b8c837_95420d694e0a40de886ba18e1d17b003.pdf
    • https://static.usrfiles.com/ugd/52b593_9f4275d0db6347de92bd793f878d4484.pdf
    • https://static.usrfiles.com/ugd/80c1db_bbf548e7c79e445495a6beb9e3c9ffae.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed9760caa78041888ba70a56e72639cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d963c41c3254c718a19e9826dba365e.pdf
    • https://static.usrfiles.com/ugd/63d3ad_18957796105b4caf8ffdbf2f8182d96b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3dd0371af56e42128cb15d9a4eb90424.pdf
    • https://static.usrfiles.com/ugd/74a852_f85bb5ddea0a40408207e08366f4dec1.pdf
    • https://static.usrfiles.com/ugd/837d34_fe9143322fcf4b20a451bdd5e55ea9ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_96fd505f73ce4c528ffd0cc23ef824c5.pdf
    • https://static.usrfiles.com/ugd/67e251_839ae465161a4b529685957266b47e9e.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f61.bin
61c9940a63409d59c9bc20a3b666fb591b367050c4b525cc8d2f0dcd63f5c18c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F61 5220 bytes
font_01_sfnt_off00008125.bin
5f158297163e694d8ee339b2d16f958a8db4ca14f85297537a1555eb0d802cd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8125 10716 bytes

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