Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b12baada03076a5…

MALICIOUS

PDF

37.7 KB Created: 2020-08-31 08:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46ffff8ef9dc1d430964b3bebb0c646a SHA-1: 4feb45cc3e0ce7ca6e85866f47fd9fe1a4f76d5f SHA-256: 0b12baada03076a5ba46da046236aa9eaf8468b77773a4a5210f9acf29d69346
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to a redirector URL known for malicious activity. The document body, though heavily obfuscated, also contains the same redirector URL and numerous other links hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content. The ML classifier strongly indicates maliciousness.

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=mixed+tenses+exercises+past+and+pres
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1559/4399/files/aiims_assertion_reason_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0447/9172/6240/files/java_user_input_string.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/kupowelizoliboxel.pdf
    • https://cdn.shopify.com/s/files/1/0441/1791/7848/files/53452265846.pdf
    • https://static.usrfiles.com/ugd/b8c837_98999d05c9434b8fb7a634a0e4bb6b43.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fd7f8ff25d8455e83d95834c6718109.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc54f51267794afc8cbdc6b3a2ef52f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab89e308f1e74511b47174b0abef6d3a.pdf
    • https://cdn.shopify.com/s/files/1/0433/1316/8542/files/doxinixaxivu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7285/5957/files/carbonato_de_calcio_medicamento.pdf
    • https://cdn.shopify.com/s/files/1/0431/3209/2573/files/physical_science_bill_tillery_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/xajudajematu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/14970558410.pdf
    • https://cdn.shopify.com/s/files/1/0432/1958/3133/files/43061616940.pdf
    • https://cdn.shopify.com/s/files/1/0437/8220/9698/files/pdf_biodata_format_for_marriage_for_boy.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepudanunakadop.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/gazudomejaw.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_off00005605.bin
091268535747d2d2ffaeb2fa2ca9d16ff79669c9b82108a84b1ed0c44e5d98f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5605 5108 bytes
font_01_sfnt_off0000676f.bin
05f7461034eedf057ca5e8860c8714d78a7c974c06c17d12a460ba9d3207a0cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x676F 9996 bytes

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