Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c4ca02b7bedb8f…

MALICIOUS

PDF

36.1 KB Created: 2020-09-03 09:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9daaf10df699c1724ce903da2ddc2c8 SHA-1: 3df18c619ea871f4bcad5d84907f234dee8ebb3f SHA-256: 00c4ca02b7bedb8fccaab7c08f1d81115e7624b61b5ccebd7a50dfa1c4af5bd8
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to sheet music and the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, further supporting a malicious intent to distribute content or redirect 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.me/wix?keyword=benedictus+euphonium+sheet+music
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e1c37d_d75555d024b848479a7dafbbf04ed154.pdf
    • https://static.usrfiles.com/ugd/b8c837_86313ea7cb184f0ea31e33c1249df491.pdf
    • https://static.usrfiles.com/ugd/5cf23b_3bd40fcde63046deafaee0042fa55a97.pdf
    • https://static.usrfiles.com/ugd/f99735_0c8b9e56b8614f9ebf1152793e9dc347.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec3d689228164c1db9f51abafd93d476.pdf
    • https://static.usrfiles.com/ugd/b0b521_7a46a0a2b43741989b77a2ef9f2a9202.pdf
    • https://static.usrfiles.com/ugd/b8c837_465b0c3ebe4b43219b3f6ec87d22ccf5.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb337cc5f30340fc93be43de54c95934.pdf
    • https://static.usrfiles.com/ugd/1c8c1e_b9a20a256ceb41ddbc7d7540e9c926f0.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3674/files/xelerowujufufukesoxofob.pdf
    • https://cdn.shopify.com/s/files/1/0431/7881/9735/files/jefigofag.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/adobe_sketch_apk_full.pdf
    • https://cdn.shopify.com/s/files/1/0432/6067/4198/files/the_sworn_book_of_honorius_review.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_off00004e92.bin
92562690e11bde06e54169fbc4b6936c3e6981151f8e9f26d73c16a9b32f0352
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E92 5024 bytes
font_01_sfnt_off00005f8c.bin
8530bf6d73d85b6904db32b799c9f590e546f3a110b1741c8fc37390df860501
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8C 10616 bytes