Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c52912c566976a…

MALICIOUS

PDF

52.1 KB Created: 2020-10-26 00:24:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0c8d4ae82d5cd8e2419523801cf657a SHA-1: 1b4a3d583c4a1681dd0dfb26b24de8ce13f355e2 SHA-256: 24c52912c566976abbbcbf7c0f5daab9966eb076743ac0fb8880ec8961ef87e8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external PDFs, a technique often used for SEO manipulation or to host malicious content. One of the embedded URLs, `https://ttraff.cc/123?keyword=english+grammar+oxford+university+pdf`, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document's structure and embedded links suggest an attempt to redirect users to potentially harmful content.

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/123?keyword=english+grammar+oxford+university+pdf
    • https://cdn-cms.f-static.net/uploads/4369161/normal_5f88f35ee3c60.pdf
    • https://cdn-cms.f-static.net/uploads/4405440/normal_5f95962549f23.pdf
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f87228e892e0.pdf
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5f87350a9ce95.pdf
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f9050b8e2df9.pdf
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5f95b26a0d507.pdf
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5f88dc2977d14.pdf
    • https://cdn-cms.f-static.net/uploads/4412391/normal_5f95414e838ab.pdf
    • https://cdn-cms.f-static.net/uploads/4378157/normal_5f913edb86011.pdf
    • https://cdn-cms.f-static.net/uploads/4388617/normal_5f90bbf940f20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8ef25ad1-0978-44b6-90fc-109c44e1c80c/jafuniwipuzifuvafo.pdf
    • https://uploads.strikinglycdn.com/files/5f9fa3a6-54da-481d-aedb-5eccd706e51d/82150080054.pdf
    • https://uploads.strikinglycdn.com/files/ae1f0880-9e83-4df6-9c24-0a2bdcaf36f0/kobetapumadedukitakekeze.pdf
    • https://uploads.strikinglycdn.com/files/cc453492-8397-48ee-b022-99ccaefdf63e/88037452425.pdf
    • https://uploads.strikinglycdn.com/files/b23eba97-ecc7-4c4a-a5b8-920c41778934/como_separar_palabras_en_excel.pdf
    • https://s3.amazonaws.com/mefadedosuw/32225010703.pdf
    • https://s3.amazonaws.com/wonoti/79747581184.pdf
    • https://s3.amazonaws.com/wonoti/wediz.pdf
    • https://s3.amazonaws.com/felasorarabipis/zixidafawozejuzonix.pdf
    • https://cdn.shopify.com/s/files/1/0266/8819/2681/files/filtrete_3m_thermostat_wifi_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2800/4507/files/78842686185.pdf
    • https://cdn.shopify.com/s/files/1/0502/3540/8576/files/coping_with_anger_worksheets.pdf
    • https://s3.amazonaws.com/mubefula/concept_of_equality_in_political_science.pdf
    • https://s3.amazonaws.com/sixenogafopoj/sobowefaduwefejevonum.pdf
    • https://s3.amazonaws.com/lewuli/calendar_2017_week_numbers.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_off00008c43.bin
97dff2a1d1fb3749669055933dc728f15fc884779725df9753c5377e0a145f50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C43 5640 bytes
font_01_sfnt_off00009f5b.bin
006bdfc06bd65719439726453ba65714d9aafd6076505183e43cba6b0989f84b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F5B 10304 bytes

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