Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5bed4de05ce437…

MALICIOUS

PDF

47.5 KB Created: 2020-08-19 23:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2b780dcc4bfdd9853a49640e0e0dab8 SHA-1: c1491885f90eca07c0447cc49e55a450716c7861 SHA-256: 0f5bed4de05ce4373e52914c57211d3410d93b070f60aaf4ad795bdb9e013765
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and several other URLs pointing to PDF files, suggesting a link farm or SEO spam campaign designed to lure users to malicious sites.

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/pify?keyword=agneepath+song++bestwap
    • http://nobuluz.bullsbard.com/uploads/1/3/1/4/131408854/705035a4a17e1c.pdf
    • http://bokamovur.foodyounebes.com/uploads/1/3/1/4/131437254/xoroxe_ditewiv_kozuxigal.pdf
    • http://files.stgabrielepiscopalphila.org/uploads/1/3/1/4/131406288/41a458f911679ab.pdf
    • http://files.ericeckhouse.com/uploads/1/3/0/9/130968996/0a632bcf834.pdf
    • http://files.sagewindowcleaning.com/uploads/1/3/1/0/131070911/pebumup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0454/7385/7686/files/accident_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0431/2190/1729/files/budegurawovajub.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5290/files/modern_chess_openings_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/77363931764.pdf
    • https://cdn.shopify.com/s/files/1/0431/3769/5906/files/jockey_full_of_bourbon_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0037/files/cardiotonicos_y_antiarritmicos.pdf
    • https://cdn.shopify.com/s/files/1/0433/3964/5093/files/98575024417.pdf
    • https://cdn.shopify.com/s/files/1/0435/1908/2655/files/71209825989.pdf
    • https://cdn.shopify.com/s/files/1/0437/6634/9975/files/cateye_padrone_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/adjetivos_calificativos_en_francs.pdf
    • https://cdn.shopify.com/s/files/1/0431/0545/2193/files/85190339086.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2953/files/25167695575.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_off00005b1b.bin
ed36ecfa37b62c3f4257f0929950a5b5d24964ae57ba09a402660ab501df8194		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1B 5172 bytes
font_01_sfnt_off00006cc5.bin
5f731ee6ae0bf7f71310edde508c8bfdacd025a20c72c262a9966e921ec33b26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC5 15060 bytes
font_02_sfnt_off00009bec.bin
3bb08857b08983a257d5a2052628e18542fd51c8d29f5bbef87ea8b8ace00841		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BEC 16096 bytes

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