Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4040ff750e1e0a2…

MALICIOUS

PDF

40.1 KB Created: 2020-09-01 04:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 254b5d473dd85dcea134ce9f00ae3391 SHA-1: 6bd8be37a739fb33682bc6e16bb1297179d0f7ad SHA-256: b4040ff750e1e0a2c1c3643ae3513f868ccef28ef5abf1e9866dd5520c4d6eea
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on shopify.com and static.usrfiles.com, indicating a link farm designed to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=academy+of+management+and+information+technology+odisha
    • https://cdn.shopify.com/s/files/1/0436/9544/0040/files/android_os_version_percentage.pdf
    • https://cdn.shopify.com/s/files/1/0431/7937/6798/files/free_cartoon_animator_4.pdf
    • https://cdn.shopify.com/s/files/1/0438/6275/3445/files/libro_de_pares_biomagneticos_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/shareholders_agreement.pdf
    • https://static.usrfiles.com/ugd/07e02c_2aba8e5359d444c0ac11059f34eb8555.pdf
    • https://static.usrfiles.com/ugd/158fb9_6bc4c76f0b144645ab2aa8e983b0a129.pdf
    • https://static.usrfiles.com/ugd/c1108c_e5bd29e5bc2b4322b30b8b8e55b21f81.pdf
    • https://static.usrfiles.com/ugd/764aaa_66f3b7b673294b5fb464f09f3d6b2c37.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0d0e11fb6cf43d29792f026b4d63c22.pdf
    • https://static.usrfiles.com/ugd/97368a_fed967f3902749808c4772ffd27f2ef6.pdf
    • https://static.usrfiles.com/ugd/b8c837_b92fa0b6174c46968c8cddc0ad240f12.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b115f2842dc46fd86c817f23cd85627.pdf
    • https://static.usrfiles.com/ugd/1df9ea_bbe97e685f6c474aa7cc9749a6bcafa5.pdf
    • https://cdn.shopify.com/s/files/1/0440/5392/1957/files/neisseria_gonorrhoeae_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0440/6149/1352/files/pixie_hollow_games_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/7606/6207/files/18307882213.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7248/files/ranafurozawi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8879/6065/files/consumer_reporting_agency_contact_information.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_off00005abf.bin
bedef9a1b51f4755139c4734ee7dc834a092be8fd65ee39b9ac0283bb18fdd78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ABF 5524 bytes
font_01_sfnt_off00006d74.bin
ded357ed820061e50b84bcde9ccc4abf7713748b0b48fefc3f82f6d5628e9aab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D74 11416 bytes

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