Malicious PDF — malware analysis report

Static analysis result for SHA-256 6307c5789975b3dd…

MALICIOUS

PDF

45.4 KB Created: 2020-08-20 18:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5646ff02ef005fc0092171ed97b2643 SHA-1: 76058af0009ec99e0d419905698f32e7dca7ff50 SHA-256: 6307c5789975b3dda8511ced0fcc827df40336c8e7b540234b3d4bcb0ec1e500
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and other links pointing to various PDF files, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated 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.ru/pify?keyword=chloroform+definition+in+spanish
    • http://jamuduf.groundhogproof.com/uploads/1/3/0/7/130775982/marijatafubab_tamunu_fobeteguwi.pdf
    • http://files.riscooper.com/uploads/1/3/0/7/130776757/1995177.pdf
    • http://wasajixa.cathywmsart.com/uploads/1/3/1/0/131071047/galebubu_gomukiwusogeke_wadujokaxoluto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/the_economist_2020_vk.pdf
    • https://cdn.shopify.com/s/files/1/0434/7668/0870/files/honda_crv_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/5432/6179/files/setofo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pujipipokumamidepuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64831632673.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1588/files/85819376103.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/62655344026.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2952/files/baximenogusoxafopilosada.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/70577507708.pdf
    • https://cdn.shopify.com/s/files/1/0433/0340/3678/files/22847778372.pdf
    • https://cdn.shopify.com/s/files/1/0428/5018/9478/files/naberelinurivesipu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5788/6870/files/amls_completo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0958/files/chander_pahar_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4099/files/29433950825.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cd6.bin
59be0f04a375be9f70e7534770af550263c173a805243a029377823046d0d23b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD6 5188 bytes
font_01_sfnt_off00006e51.bin
a04374867ecfb3492f2c7202e30bb05e5212501a066d04a6b368f524b117c52f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E51 10644 bytes
font_02_sfnt_off000092d8.bin
7f3d042674398884008b5fd8b97700564c6de2c791e1cc6f34233f4a52db9ecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92D8 16232 bytes

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