Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0f250149acf605…

MALICIOUS

PDF

50.9 KB Created: 2020-10-20 23:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bac742b94407be822201f636750ecf17 SHA-1: 8c5fa4351010b86e8ce2e8d41968e6fa631d8b6a SHA-256: cf0f250149acf605f86e465855d3bdcecb40c2c21da9131a230e3be0447d67ed
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/strik. The document body, though heavily obfuscated, contains a reference to this URL, indicating the likely intent is to redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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://cctraff.ru/strik?keyword=what+is+low+priority+queue In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_5f8d34b4b5d09.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/5a66fac51917.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/100292.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/jixidused.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/238a2.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/xopevu_vilugarokobijos_fimorekon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8175/3288/files/nbme_step_2_form_4_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4494/1223/files/meforetozesopuxixe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7075/8805/files/the_book_of_lost_things_audiobook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6528/6549/files/100_to_110_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/48718967538.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/30036510301.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/barixunesawaturiwafumeka.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/45635525202.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/3876/1109/files/mawifos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8309/3910/files/vodefugar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5462/0059/files/45007387145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3de9464-0449-4c5b-b653-97188da607da/95816837642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64895e1-655e-452a-8113-d1f13300540e/22666820220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89d9aaef-853c-4bbe-9320-b93d62dffd2d/71050822379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1852761a-9098-42d0-a655-0654006c5f6f/89604019941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c863114-c539-4ea5-851b-3ce1d20371f9/libefe.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_off000088d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88D2 5240 bytes
SHA-256: 19882418d20a04563614301caf5876da5ab8702ce5458e369a73ea44f48e0812
font_01_sfnt_off00009ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC1 10508 bytes
SHA-256: e31fc07cf04a5fd4b59d8861ccdf5ca1d8e29cbe64b2f56f1dcd44a5e1f3724d

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