Malicious PDF — malware analysis report

Static analysis result for SHA-256 05528b3df50bea52…

MALICIOUS

PDF

36.0 KB Created: 2020-08-29 04:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a87fbc6dbb9fb99cfd5af76062866ebb SHA-1: 93d38a31454436a5e923ac84088f1ed70d20554d SHA-256: 05528b3df50bea52d320f7c12ad1ba2fd0568494c289c3818b3b4aaa1d277d5e
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as an audiobook title, which leads to a known malicious redirector. The PDF also hosts a large number of other PDF links, likely for SEO manipulation or to obscure the malicious destination. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, potentially for phishing or malware distribution.

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=prince+lestat+and+the+realms+of+atlantis+audiobook
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/4645/8776/files/71136822363.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/avast_antivirus_license_key_free_2038.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1320/files/nagojimuzufofomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5344/9367/files/somixedabarunemeguxeg.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4c1cb08f05847df90149f31b834ffd9.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6d1bd74e1ed48cfbab58e620ec35ab0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e2117e68b004dbc897498a972b48566.pdf
    • https://static.usrfiles.com/ugd/b8c837_07678323f78b4d569390d06684eff081.pdf
    • https://static.usrfiles.com/ugd/b8c837_58ab13cd913f46148ffee3d58e94a141.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5d220dd90284c729c86f96fde353a67.pdf
    • https://static.usrfiles.com/ugd/b8c837_947bb5f389fb4debabc2e21b2e1a5749.pdf
    • https://cdn.shopify.com/s/files/1/0434/3480/3352/files/48190744163.pdf
    • https://cdn.shopify.com/s/files/1/0434/3745/7574/files/84828236143.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/99383921385.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8695/files/71005016388.pdf
    • https://cdn.shopify.com/s/files/1/0438/0141/1744/files/97156952152.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_off00004eee.bin
f8b6c80f6609f3a3ba41bfa0343cb80f1cce6b89031f78e8911481c208dc395c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EEE 5464 bytes
font_01_sfnt_off00006145.bin
1ee904c3054c066819a1a24f3458658eb460dc6632c62e0d2b51cc79cb727327		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6145 9820 bytes

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