Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38bc87e13734a1e…

MALICIOUS

PDF

45.3 KB Created: 2020-09-11 02:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2498a81f51565413bbb32ee13638f9ca SHA-1: 5d4def89c6536ac5b06b2d2c3ed82770b5fa2e28 SHA-256: b38bc87e13734a1e6e55e37eb0b4dcc4979375f6f2518e908529c5a4acdb0c6e
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.me. The document body, though heavily obfuscated, contains the same URL. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior. The presence of numerous external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning attempt to distribute the 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.me/pify?keyword=best+ghana+worship+songs
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/aashto_m_145_91.pdf
    • https://cdn.shopify.com/s/files/1/0433/9764/4449/files/bodofewem.pdf
    • https://cdn.shopify.com/s/files/1/0440/2138/3333/files/cadena_de_coros_cristianos_de_avivamiento_letra_y_acordes.pdf
    • https://cdn.shopify.com/s/files/1/0438/9748/7512/files/bharti_axa_general_insurance_online_policy.pdf
    • https://cdn.shopify.com/s/files/1/0437/7880/1822/files/daxujerepesixewux.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/patient_information_sjogren_s_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0432/1850/1799/files/drop_columns_pandas.pdf
    • https://static.usrfiles.com/ugd/e33828_2ebf15c6458c41b1b2fdf63e7829b533.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_6e9b225b15ba48be82645435df469657.pdf
    • https://static.usrfiles.com/ugd/b42fd6_7c5a660cc90a4420a6a385c46b1b02d2.pdf
    • https://static.usrfiles.com/ugd/4fb05f_7f98304e96b049bfbe828b0c523e8caa.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_off000074fa.bin
cb9ec14f2c7a25b0fcf548e6f631e1393c3cbb370ebda921b213129c8e2b105f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FA 5188 bytes
font_01_sfnt_off000086b7.bin
16b3b54bc90c68733165ed1e31a0d760c0b07dfe6dcc5e69506f02e596919fba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86B7 9992 bytes

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