Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c3baec04fc572e…

MALICIOUS

PDF

56.3 KB Created: 2020-10-25 19:03:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7e644dd397e602d844c982b08bc5afab SHA-1: 9c983692089a8d6916dbf03007e5f8990b679cef SHA-256: 16c3baec04fc572e7ec161fa8331549f56aac41d794cd3123f0d1ec74ca94bda
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external PDF files, indicating a link farm. One of the embedded URLs, 'https://gettraff.ru/strik?keyword=ensayo+descriptivo+caracteristicas', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. These factors suggest the document is designed to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gettraff.ru/strik?keyword=ensayo+descriptivo+caracteristicas In PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/597cad04.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/nupurapitupibu.pdfIn PDF document text
    • https://regajuwanuduxis.weebly.com/uploads/1/3/4/3/134319991/xowazonu_wugaxizata_walamukutid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379370/normal_5f8f9b6503f08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381978/normal_5f8d1706bad50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f88439db4943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5f8a8d6b37615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378855/normal_5f8b582c5a2af.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://cdn.shopify.com/s/files/1/0484/5053/5578/files/aparato_de_golgi_funciones.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5573/4167/files/94155907035.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5404/6618/files/god_always_guide_me_quotes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4807/3899/files/platelet_function_testing_by_aggregometry_approved_guideline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9800/8472/files/teaching_transparency_worksheet_summary_of_reaction_types.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/5326/6070/files/muxapofodeduvozebaxulajuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8011/2535/files/eddie_bauer_stroller_used.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/8189/2508/files/22847513536.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7073/2456/files/muay_thai_boran_techniken.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8240/8644/files/15134679968.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5738/1027/files/copy_worksheet_paste_values_vba.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/fumawamewanabedeto.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/lodozefarelu.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/bonefonalekuxitoneni.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/20315776263.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_off00008e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E88 4944 bytes
SHA-256: 2d676f082a73452af8d527cc13f4c580ab12c1a26924e4ae13b50090c5d45ec6
font_01_sfnt_off00009f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F6A 11124 bytes
SHA-256: 92d81d9ec0103fc4104860a3889a931b49fe19fdd53293c0e2a6ccff479b60f6
font_02_sfnt_off0000c39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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