Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92b8c7f56502062…

MALICIOUS

PDF

51.7 KB Created: 2020-08-29 13:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebe3bef9c70c38ce273b40d20857bd54 SHA-1: 68c7f3815c7ea2deffd9dd89a091651e68d4f1d7 SHA-256: a92b8c7f5650206252d17d2f6cd3143c549467ab4a2b40bed9c6f3da3fff1735
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominent URL identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Aspose html to pdf page break' and the malicious URL, suggesting a lure to a malicious site. The presence of numerous external PDF links also indicates a link farm or SEO poisoning attempt.

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/wix?keyword=aspose+html+to+pdf+page+break
    • https://static.usrfiles.com/ugd/b8c837_6aaa9f68651048268ace09a762b54369.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5454b90080f4979982861724bee7770.pdf
    • https://static.usrfiles.com/ugd/b8c837_315e0bff97394a35989d9f9c21f5370a.pdf
    • https://static.usrfiles.com/ugd/b8c837_535d5e5d905d4592bf1b433bcf1437bc.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1978/files/74895534543.pdf
    • https://cdn.shopify.com/s/files/1/0432/0726/2370/files/are_all_men_pedophiles.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0564/files/mozupeni.pdf
    • https://static.usrfiles.com/ugd/b8c837_128d2447e7e54244b1d2e2b62307664e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c609ff2d41594f608c9ccf7feb3857ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9dd1f4941204249bc8796e2d77bc6a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ec3a8206cf54e858aaf867711047b19.pdf
    • https://static.usrfiles.com/ugd/b8c837_98b8e68f9a124837b2e32dd7f6625552.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_off00007e7a.bin
162ccb219cf13be126383e750b9d5b9d3c9deed844163d6d9c886631b21c2561		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E7A 5648 bytes
font_01_sfnt_off00009187.bin
d7522c03c4e44c803d2ce115d3bf75f0dea73811f704c962f2900d303bdafff3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9187 15588 bytes

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