Malicious PDF — malware analysis report

Static analysis result for SHA-256 f858b38371633d52…

MALICIOUS

PDF

74.0 KB Created: 2020-11-05 08:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e861b4ddcd943a44e0612ebe24059394 SHA-1: 1f9546cd7508c3aa30f029b0efd5f05f89dc834d SHA-256: f858b38371633d529811101a9fb196d49374a24128e4c8ab5f6902b9e5e3bf4e
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=destiny+2+wiki+dlc In PDF document text
    • https://tadadali.weebly.com/uploads/1/3/4/0/134095934/donimulej.pdfIn PDF document text
    • https://fufiganegobugu.weebly.com/uploads/1/3/4/4/134496384/d158ef5c0.pdfIn PDF document text
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/butadetasiw_mogededux.pdfIn PDF document text
    • https://nukawidizuzaxep.weebly.com/uploads/1/3/3/9/133997642/863fa.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/forunanu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8f199b39-7046-4703-abba-ff22ed0c0720/8675768926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4513e88b-2a2b-4fb6-9c2d-bf2bd4543b94/zoberij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11db142a-ba09-431c-9634-916cfb60b7de/gakenew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c02e60-281c-4265-88af-d3986534ef25/grandma_got_run_over_by_a_reindeer_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1553da74-7410-4359-8cc6-213237736a7f/60548674104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b19a1728-971d-4694-aca8-7355d173f091/dekosemuwunawubunubos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9f375e-0496-47f5-9dbf-aba627f22484/bulopezesepezoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a886372-22a0-4780-afe5-be8d26242c37/lomumikafidogumimivozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d62005-45c5-4129-93eb-9cb6012de45d/39237436768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3685dd3c-8698-4ccc-a62e-a767d2ca2b29/forza_4_game_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD690 4692 bytes
SHA-256: 27b668062aad690f8640a157eebb39ab388d6585f346300ad24a9529c8709f0e
font_01_sfnt_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 11520 bytes
SHA-256: dc91d3b7467fc7f298b93fc49d64e49401646682d28f363206e08a5fd7511976
font_02_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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