Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c31657ed23418b…

MALICIOUS

PDF

42.1 KB Created: 2020-08-19 10:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1147aef1b1b599503a8430acf4187c2f SHA-1: c5ababf1dd2d29ada3acc3bcb8e0d51132666222 SHA-256: 61c31657ed23418bdb63e10e51439c7071cc25b0b025d295394123e994ec349d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. It also exhibits characteristics of a link farm, with numerous external PDF links. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting a lure to download further content or visit a malicious site.

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.com/pify?keyword=contactor+wiring+diagram+with+timer+datasheet
    • http://mexuzabe.deucesdogcleanupllc.com/uploads/1/3/0/7/130738697/batibalulavuji.pdf
    • http://files.grapesociety.org/uploads/1/3/1/4/131437322/7399305.pdf
    • http://files.mrslorenzscience.com/uploads/1/3/2/6/132681826/762982.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/logesolupam.pdf
    • https://cdn.shopify.com/s/files/1/0454/1775/8888/files/job_application_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/5471/9395/files/handbook_of_histology_methods_for_bone_and_cartilage.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0245/files/blockchain_revolution_don_tapscott.pdf
    • https://cdn.shopify.com/s/files/1/0432/5248/2208/files/broccoli_enter_the_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/lekofivobigewefir.pdf
    • https://cdn.shopify.com/s/files/1/0430/6331/2533/files/gemelozurotazovamuganariv.pdf
    • https://cdn.shopify.com/s/files/1/0437/6975/7850/files/mad_libs_worksheets_for_adults.pdf
    • https://cdn.shopify.com/s/files/1/0437/5629/0206/files/information_bulletin_neet_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7654/files/el_anticlericalismo_en_mexico.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_off000066d6.bin
ab3d050b5b432e2b46888c5711273358ba1349142bb19e6f40e1a80b776ce3fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x66D6 5320 bytes
font_01_sfnt_off000078c9.bin
874459090709921bb3ca37d46db22d717809531e34fbd83b92fb943fe3d37b58
pdf-font-stream PDF embedded font (sfnt) at offset 0x78C9 10132 bytes