Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bb9996fdf920ad…

MALICIOUS

PDF

57.8 KB Created: 2020-08-30 17:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9a3975fff3de75f747e635c32571b1d SHA-1: fdd6fd941fd76690a89a9bcada9d066a2f0810d0 SHA-256: 87bb9996fdf920ad1a122fea228a10e92605355533a367a00c993ffb79349840
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to malicious content. The document also features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector indicates an attempt to lead the user to a harmful destination.

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=air+density+vs+temperature
    • https://cdn.shopify.com/s/files/1/0433/0985/8984/files/32794458565.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/bass_guitar_for_dummies_free.pdf
    • https://cdn.shopify.com/s/files/1/0457/0031/7340/files/bigetelu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0104/files/38542822256.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/48016216100.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cbf32c67fcd438ebdac23d0626f80df.pdf
    • https://static.usrfiles.com/ugd/b8c837_a50c5eb6719045658286e5b0bcf964b7.pdf
    • https://static.usrfiles.com/ugd/0047a4_364ca63997704ace927f63c722bc7992.pdf
    • https://static.usrfiles.com/ugd/d99ef3_727da8db330f4bd886a19e96c47ad4a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_d801b17f6e474cd98976e2442d16ce8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2e7247bb0044db9b5e64c5a0c58f8ea.pdf
    • https://static.usrfiles.com/ugd/4725f1_ca7a5b70e68941a1a5f7a2c6691de6fb.pdf
    • https://static.usrfiles.com/ugd/7ff653_f93bc9f086a744d987013792f562ecb9.pdf
    • https://static.usrfiles.com/ugd/b8c837_de3c9db0f874497da0122ed0da29be62.pdf
    • https://static.usrfiles.com/ugd/8ab72e_80d6748ceed14b82914a478f3008e65c.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_ceb98cedbbb245509259c5ee0c9ac8ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ae9e16d59ed47b1b9ebd420543c6745.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000810d.bin
00403427c29d80a8dd3fc22f9a8f6b099652022a6011630dd2745a420b7dec52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x810D 5224 bytes
font_01_sfnt_off000092bf.bin
2ee58bf601a78fd833d6dd36a7073ec54e28814bd69b753231de0f743be188f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92BF 15968 bytes
font_02_sfnt_off0000c537.bin
96140a770535f6e8599a46dec5e6ea1dfde29ad9c00fac6d34de2851656df9a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC537 16104 bytes

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