Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a83c5873472f143…

MALICIOUS

PDF

46.9 KB Created: 2020-11-01 08:27:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7755fd7159beba23046356c3e9a94b1e SHA-1: d5e05538aabb2a695e5d442eac23ee0d81f13ea9 SHA-256: 2a83c5873472f143e4261589c32a095267b41976bda2f51fd26eaba2eb3ec01a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful sites, disguised within a document.

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/123?keyword=take+5+tab
    • https://mupaxezofede.weebly.com/uploads/1/3/4/3/134317166/312ed14e14e3917.pdf
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5f97f9ddee4c9.pdf
    • https://cdn-cms.f-static.net/uploads/4391037/normal_5f924bb26102f.pdf
    • https://cdn-cms.f-static.net/uploads/4379960/normal_5f8bb103867bc.pdf
    • https://cdn-cms.f-static.net/uploads/4392237/normal_5f9451c458017.pdf
    • https://cdn-cms.f-static.net/uploads/4386086/normal_5f934ad7620ee.pdf
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/c5cb0a4cd849.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/95561fc0-2920-463a-b27e-4c2da695c1f5/26583268951.pdf
    • https://uploads.strikinglycdn.com/files/16d4c4a5-8d74-4e40-99c3-85ccb20eda51/pastillas_para_adelgazar_meizitang.pdf
    • https://uploads.strikinglycdn.com/files/28e2b3bf-db7f-4a92-bd33-bb80e0d1e5fe/dasilepobibatedutof.pdf
    • https://uploads.strikinglycdn.com/files/39c658cc-c9e0-403a-b155-019717ae98f5/84985918014.pdf
    • https://uploads.strikinglycdn.com/files/e74c72fb-3461-4b87-baa5-815eb1b1212b/vigorol_liquid_hair_relaxer.pdf
    • https://uploads.strikinglycdn.com/files/43d4ec53-e3e0-4455-a9af-36ce62a0e6ed/mascarilla_simple_de_oxigeno.pdf
    • https://uploads.strikinglycdn.com/files/6db50bcd-fd14-47c6-b870-0171a0fe1649/vijimijojovanopavomid.pdf
    • https://uploads.strikinglycdn.com/files/c29b4440-3cfa-4d3a-812e-f42525185fe4/deku_hero_costume_evolution.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007167.bin
06a8331ba22eea7c3be14ddd666ced0a086021c24d340189bb5a6b7d5d2775e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7167 4652 bytes
font_01_sfnt_off00008150.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8150 1800 bytes
font_02_sfnt_off000089de.bin
e6f160ae782c826c5b3d72556339c55c19de73491498a12c806424bee93be7d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89DE 10728 bytes

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