Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4b9fe0b8cf87b1…

MALICIOUS

PDF

45.4 KB Created: 2020-08-30 19:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 188f8e78f4e0661535deee7817cf0c45 SHA-1: 93ded779db45dad3eade4e444f835fa2fd1e2d2b SHA-256: bc4b9fe0b8cf87b1ae21e32de18370e0ac1f6b8b3f0a323cc7b0a49925aff299
152 Risk Score

Malware Insights

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

This PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. The document body and embedded link objects reveal a large number of external PDF links, many hosted on static.usrfiles.com, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://ttraff.com/wix?keyword=best+smart+doorbell, which is likely used to redirect users to further 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.com/wix?keyword=best+smart+doorbell
    • https://static.usrfiles.com/ugd/b8c837_c53fce6494ad447ebf461da4fc0fe626.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee6500cddca948f0a9db217b15bce96f.pdf
    • https://static.usrfiles.com/ugd/11f207_eb940b246dab40869d1f672783c46dcb.pdf
    • https://static.usrfiles.com/ugd/b8c837_8248881cd20f4675976cd3134e834118.pdf
    • https://static.usrfiles.com/ugd/d5415a_b388cffa5a704209b84e1218bfaa5837.pdf
    • https://static.usrfiles.com/ugd/cf14a4_5d9d0adcd80d429d96a3ae3788e99487.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_b0431ac86c9a45b4a49f37107f8798d8.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9784/files/addition_grade_1_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/dinowejiruzupeg.pdf
    • https://cdn.shopify.com/s/files/1/0439/0384/4520/files/cloverlea_primary_school_ofsted_report.pdf
    • https://cdn.shopify.com/s/files/1/0451/8638/4023/files/legend_of_zelda_encyclopedia_download.pdf
    • https://cdn.shopify.com/s/files/1/0459/8978/9855/files/rurobowakupu.pdf
    • https://static.usrfiles.com/ugd/b65acf_15cabfe632f84dcdb9f62063c03cb569.pdf
    • https://static.usrfiles.com/ugd/e643da_b5f00e490dae4e8e8b28c35f82b81240.pdf
    • https://static.usrfiles.com/ugd/07e02c_706b1538f7e24c3484bc3391c0956009.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f676f4ff3d146058fef31fa5db7fc70.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_off000074b9.bin
378b47366b9e3fa9dc3166ed314bd72b35e8ac1d87b24e1ba16af1c4e1d88e4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B9 5160 bytes
font_01_sfnt_off00008622.bin
a051eab76cc96fae42e508a6a1293fa70cb252981a74d3336a065c5de991c341		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8622 10076 bytes

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