Malicious PDF — malware analysis report

Static analysis result for SHA-256 de74a0f4c933d75a…

MALICIOUS

PDF

38.4 KB Created: 2020-10-29 00:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7581c8d5521ddcabcc85337ce2689957 SHA-1: 2e930cce433281e6b312114b0d3d9a08990ab93a SHA-256: de74a0f4c933d75adec2d49392cbfa4faa40e54eb527574ddeb7ee36381ce281
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The document body text, though partially corrupted, includes a URL related to 'escape the prison unblocked games', suggesting a lure to entice users to click on the embedded links. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/aws?keyword=escape+the+prison+unblocked+games In PDF document text
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/mipusujafegugojirax.pdfIn PDF document text
    • https://notupazepikinis.weebly.com/uploads/1/3/4/3/134382888/5676a085c5e.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/lusafagakolo.pdfIn PDF document text
    • https://savakorudefipe.weebly.com/uploads/1/3/2/3/132303238/bbe9be10d12.pdfIn PDF document text
    • https://gawubodukajine.weebly.com/uploads/1/3/0/9/130969599/mesijokaz-wusuxukido.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/rofulujo.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/6b3d598.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/watogijimo.pdfIn PDF document text
    • https://bopiwode.weebly.com/uploads/1/3/4/3/134367631/9e179088023.pdfIn PDF document text
    • https://gumoxeladupeguv.weebly.com/uploads/1/3/4/3/134318886/a8ff5f56885.pdfIn PDF document text
    • https://guvapokasek.weebly.com/uploads/1/3/4/4/134437462/lasokiwovamu.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/zigijujigivebuwizax.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/9431e234-bd4a-4fa1-add5-6ff52fa4756d/94217527110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df64a999-3131-4b3d-8d18-b7138c8437d6/tanlayc_dallanm_aa_rnei.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44b93593-ecb1-4882-95dc-960f17db5225/35254191239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d60e19-fb9c-4e46-a60e-cd5511a3e905/vaxasipesosagizido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6517d884-50f6-40b4-b7ef-e7737b8f678e/332372811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d8278a-cc25-4494-abd1-a00008497711/epson_status_monitor_3_download_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/supabunifojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15c27329-ea90-4d5e-b4e1-68757ca21d70/power_of_the_subconscious_mind.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd45a7a1-c2d3-4cf4-9c16-5cbc60ae4c62/numolifepudavinike.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/bncc_educao_infantil_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wifozuxeku/pokiwofetiwuvetexew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/016452a8-6619-4d98-aebc-92c3b91b4f89/worisevajiratajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa6fd23-492a-44fc-9c62-bc2075e38e34/7174117743.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_off00005520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5520 5648 bytes
SHA-256: cb9a1651cf3bfa0fc67cac18cefbbe772f9d617124eb6cd2a25e771b522cc7db
font_01_sfnt_off0000682b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x682B 11044 bytes
SHA-256: f688956136a9081f27737aa31c94623e3d96290b7e9d8b5f4bda571e8ace720f

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