Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d5a1d98cd5b5cb…

MALICIOUS

PDF

66.4 KB Created: 2020-08-31 22:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 522d2a2690387c857f1ceb8810a368a7 SHA-1: afbe7746e58b802b83c8aba8a70cd4be367c67df SHA-256: 18d5a1d98cd5b5cb90e8f403441be2967d2dc628e2d66a96b339054c6341004e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm pointing to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.me/wix?keyword=guided+reading+level+geronimo+stilton. The ML classifier strongly supports the malicious nature of this PDF. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to malicious content.

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.me/wix?keyword=guided+reading+level+geronimo+stilton
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/50de67_a520a89caf6a4e8fba94152743c72978.pdf
    • https://static.usrfiles.com/ugd/739437_bcd163efcf6a49e58a22b1e17ea798ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5b1d4ade9bb4405915c7c4c70ea93ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_e00ace3268334000b1725d70fca79147.pdf
    • https://static.usrfiles.com/ugd/078c79_4fa0c4978a514a8fba230f5497e92f4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb243ba64c664cde867e4be476f46504.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/arbatel_de_magia_veterum_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/origami_for_kids.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/60097777618.pdf
    • https://cdn.shopify.com/s/files/1/0434/7687/7478/files/hackerrank_sql_the_report.pdf
    • https://static.usrfiles.com/ugd/30e015_0b8cee84f231490f8ecfe8ef602e1ff5.pdf
    • https://static.usrfiles.com/ugd/12dc78_5324f7285aa4469c930e515843a8074b.pdf
    • https://static.usrfiles.com/ugd/c1de29_873e80b4bd97422ab361bfe09b347131.pdf
    • https://static.usrfiles.com/ugd/b4a829_79c2eb91d97e441aa96b2008e52c6bd8.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_off0000bbb6.bin
d1a0c2489ab98c083e55f768e4c7071dd28a5f2473a1aabea2e05fa43ccda6f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB6 5236 bytes
font_01_sfnt_off0000cd78.bin
ba2a121c7821f1e312014ec72a747d392fb89729572f58d609f5bcc07da4931b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD78 15024 bytes