Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ea8fd50466ee35…

MALICIOUS

PDF

35.3 KB Created: 2020-09-30 04:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7c8f51cfb0a898578bcc4af6e9c692af SHA-1: e4e94cc316a8a0f39398dc42501b714d1c9d10fe SHA-256: 13ea8fd50466ee359c660220ba779886412527f09d0de432de170422b2c18433
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure. The document body also contains the same malicious URL, suggesting an attempt to trick users into downloading potentially harmful content. 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://ggtraff.ru/strik?keyword=budismo+para+dummies+pdf+descargar In PDF document text
    • http://files.myartyouwearjewelry.com/uploads/1/3/1/3/131383823/7050427.pdfIn PDF document text
    • http://bupadof.softcinch.com/uploads/1/3/1/3/131380504/dd7776096a0e34b.pdfIn PDF document text
    • http://nuxino.offthebeamwoodworking.com/uploads/1/3/0/8/130814238/8505670.pdfIn PDF document text
    • http://files.basdelemstrings.com/uploads/1/3/2/6/132682327/bisakosoti.pdfIn PDF document text
    • http://files.edusteminitiative.org/uploads/1/3/0/7/130776612/2487533.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b8aaa1-b73d-4f7a-bd34-2e49b6005ee7/83221323723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2635fa28-1e1e-4e5c-b217-b9812a495cdf/827655688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb598c5-86b0-4094-bb74-7dfb3cd1235a/nobofobevuwenosuperi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e5a2b6-f692-4d17-bac7-a7822e77daa0/30623267589.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6559/8364/files/bojibef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1222/6200/files/fafamajetuwavomowiroga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7949/8917/files/jagiwekabataref.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8702/6590/files/creed_one_last_breath_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a157f7-9369-4c69-800d-6614283e4b79/75667051456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b99720df-474a-4fb8-903a-c7b288eaa9c9/sokexukolumetidovebevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf5a894b-4b2d-41aa-8444-9d56ed2d223b/keralipiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc541732-34d5-4631-86c6-1eddc3d0a0b7/pofimali.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD5 5492 bytes
SHA-256: 6f9b204db4098c5d3a390359ece0db9792f32a0058a57c42011f5b8648f97ad9
font_01_sfnt_off00005d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6C 10212 bytes
SHA-256: 0aee927e862ee15c3057f1fe84711d1d8b36b767bb4d7e1afc0b9ff8b9e339a8

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