Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c469ad3ab686f89…

MALICIOUS

PDF

36.8 KB Created: 2020-09-03 00:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bde8d9339e30473570dadd8b8d0df55 SHA-1: 2b36cfeb44985b5a8437800383c88556259e39c3 SHA-256: 5c469ad3ab686f89fb96b7ea3fbdf19719029d9955f7b3c6a2cef41e7a31bc13
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to sheet music and the tool used to generate the PDF, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.link/wix?keyword=halloween+hullabaloo+sheet+music
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6380/3046/files/landslide_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1195/files/microsoft_word_2010_user_guide_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/4209/2694/files/17602595675.pdf
    • https://cdn.shopify.com/s/files/1/0427/9717/0847/files/factores_bioticos_y_abioticos.pdf
    • https://static.usrfiles.com/ugd/aa14a9_03c8ca8c1baf4db59fce4444f145d7da.pdf
    • https://static.usrfiles.com/ugd/0582e0_52a18e6d981d40d295df0d62a0f1eb06.pdf
    • https://static.usrfiles.com/ugd/b8c837_729d092be7254e4cacead38842b70740.pdf
    • https://static.usrfiles.com/ugd/b98abb_b4e68cca722140788d771a489387851c.pdf
    • https://static.usrfiles.com/ugd/b4a829_fafbb0e4f6da499b9d409def8f6914b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_687d5e1acddd42a4a569c6aba716f1fb.pdf
    • https://static.usrfiles.com/ugd/c722c2_598d451079d34fe09f046a4c0c896ace.pdf
    • https://static.usrfiles.com/ugd/b8c837_74c8d5b9a8ef47ab906091a9d2d4077e.pdf
    • https://static.usrfiles.com/ugd/7f16bd_4c7b93a676224de4a6fa7aa7967b6754.pdf
    • https://static.usrfiles.com/ugd/b8c837_abe6bba0a8304adcb885ee555a61a8ab.pdf
    • https://static.usrfiles.com/ugd/0df15e_681c815fcdaf4733a22cb00ec4d86dbc.pdf
    • https://static.usrfiles.com/ugd/8c7d07_21ca59a9d8c94dd0aaba5ea3d19e7af3.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_off00005288.bin
c67b1d2d7c1b0e9c65e694c360370c85b8304ebd530f6911c8a758584d17ca28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5288 5136 bytes
font_01_sfnt_off000063e9.bin
b8b04ebd868c19b349ffd3758b6f0545ea1001e508ea07cb8a92f19e7f957acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E9 10104 bytes

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