Malicious PDF — malware analysis report

Static analysis result for SHA-256 618f70b83d6d8a9b…

MALICIOUS

PDF

42.0 KB Created: 2020-08-10 10:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83a55674c9d82f006d04d043c27fdf6e SHA-1: 619cb915af508e4c83aed0c3d4b4a2a0d3291900 SHA-256: 618f70b83d6d8a9b4a183c3810366cc18c142756c1d5470a97e671762ac51501
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 external PDF files hosted on various domains. One of the primary links, 'https://ttraff.com/pify?keyword=o+autismo+livros+pdf', is identified as a malicious redirector. The document's structure and the presence of a malicious redirector suggest an attempt to direct users to harmful content, likely for phishing or malware distribution.

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=o+autismo+livros+pdf
    • http://files.riveredgepubliclibrary.org/uploads/1/3/2/6/132681749/6333078.pdf
    • http://files.skilledpaint.com/uploads/1/3/0/9/130969254/dazetefeku-mowodosikifujel.pdf
    • http://files.alphagolfopen.org/uploads/1/3/1/6/131637896/2aed1d3d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/electrical_parts_7_days_to_die.pdf
    • https://cdn.shopify.com/s/files/1/0428/4012/9692/files/tomigotapidatiwipuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/different_definitions_of_language.pdf
    • https://cdn.shopify.com/s/files/1/0427/9861/2636/files/center_tapped_full_wave_rectifier_with_capacitor_filter.pdf
    • https://cdn.shopify.com/s/files/1/0431/3150/2749/files/25916298808.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/2004/files/aprender_a_dibujar_manga_desde_cero.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/zozorukudomud.pdf
    • https://cdn.shopify.com/s/files/1/0428/2014/1223/files/fosexunatapatode.pdf
    • https://cdn.shopify.com/s/files/1/0438/0711/3373/files/bolts_and_nuts_sizes.pdf
    • https://cdn.shopify.com/s/files/1/0434/4646/8769/files/solid_principles_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/8158/0188/files/4614982894.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/keycloak_rest_api.pdf
    • https://cdn.shopify.com/s/files/1/0434/0318/2231/files/c_is_digit.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_off000067ae.bin
36a6bc14062fb2d1443e3c6e0d6500c34c223760ee77ae9ed470d8290ffd1aa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AE 5272 bytes
font_01_sfnt_off00007989.bin
130c60247341ff7e1c9148fff23bacede6f3c0370d3cc36bc0e4809d98eb668e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7989 9892 bytes

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