Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf6b37c2cb518da…

MALICIOUS

PDF

91.5 KB Created: 2020-09-08 05:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eff157ec7754d34e9c9fd43a25acbc99 SHA-1: 5fdb02115a7eb406a060fdb3a72cda93476334f2 SHA-256: 6cf6b37c2cb518dab3d192ac7b8f5b5b5756112a9f5a6be0b7f85b23ebd2f1fa
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly indicates maliciousness. The presence of numerous links, many pointing to benign Shopify URLs, suggests a link farm designed to obscure the malicious destination. The document body itself is heavily obfuscated but contains the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/wix?keyword=dbq+ratifying+the+constitution+answer+key
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0462/8440/6944/files/android_version_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/8492/2526/files/89374002572.pdf
    • https://cdn.shopify.com/s/files/1/0439/3995/4856/files/amar_chitra_katha_collection.pdf
    • https://cdn.shopify.com/s/files/1/0430/6527/8625/files/jilotipujasifiwuwapibexa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/28657766720.pdf
    • https://static.usrfiles.com/ugd/be5703_323dcb7fc8004e2f99b6ba39bb39c33d.pdf
    • https://static.usrfiles.com/ugd/e8506d_ab29a9ce078549949ec1c856545907f8.pdf
    • https://static.usrfiles.com/ugd/d2cc1f_83585c44fcdf4eec9e16e6daeff404ef.pdf
    • https://static.usrfiles.com/ugd/353d00_6f29afeff5f447fc9bd65d0cddb69a5e.pdf
    • https://static.usrfiles.com/ugd/8d5d69_6116c747652a4a91bfb7f6d5ddba8eba.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4828/files/veobecn_a_anorganick_chmia_mogrovi.pdf
    • https://cdn.shopify.com/s/files/1/0439/0731/7912/files/chiari_malformation_symptoms_in_dogs.pdf
    • https://cdn.shopify.com/s/files/1/0438/8916/4440/files/organic_chemistry_6th_edition_loudon.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/nozerorepipupuvif.pdf
    • https://cdn.shopify.com/s/files/1/0454/6730/4102/files/bikaxagekisonu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/sesujalitogakisojeso.pdf
    • https://cdn.shopify.com/s/files/1/0429/6504/1311/files/anne_of_green_gables_summary.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_off000126d7.bin
43c08c9af41c1b47d3d0b0e636b171badb1443a200bcf9f4c6bd6de4eaabe312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126D7 5636 bytes
font_01_sfnt_off00013a21.bin
76d1a4dc91114a356b913b8e20feceef8368af9633a732f5acd8818ed34d652e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A21 11732 bytes

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