Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7525ad2b9d79edb…

MALICIOUS

PDF

45.8 KB Created: 2020-10-15 15:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f689168a39fed171e6368cd5feb192f1 SHA-1: f6eac3dbe915fde005b60a485dd0ddfd9c0072b3 SHA-256: c7525ad2b9d79edb33a506d802b0a73e6898c090a3c040d9716e7c534ad39f09
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to benign content, but one critical link directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves a link farm designed to redirect users to potentially harmful sites, masquerading as educational material.

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/123?keyword=sentence+patterns+worksheet+grade+4 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_5f880bc9e5ffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f87c81e12245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f881edd23470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5f87bcb34f07c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5f8830ba10867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f882de5adcc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f87493fcf258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f87d4df04c43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5f8766afe206d.pdfIn PDF document text
    • https://site-1044184.mozfiles.com/files/1044184/16120934587.pdfIn PDF document text
    • https://site-1044473.mozfiles.com/files/1044473/36835633039.pdfIn PDF document text
    • https://site-1036876.mozfiles.com/files/1036876/78883219825.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/1/0484/8749/7890/files/movirazupusiludeloxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3876/0342/files/nicotine_patch_long_term_side_effects.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5800/4117/files/39291443109.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1063/2098/files/the_cost_of_discipleship_dietrich_bonhoeffer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6997/5965/files/ap_calculus_bc_multiple_choice_2012_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6127/8870/files/53373444074.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6375/4404/files/intel_gma_x4500_driver_windows_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6729/6923/files/kikabezogajakot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9521/2697/files/gefefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c653f26-4875-4ec6-a22e-c9686a736b01/bidibumorulebujovenuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f00be5-2cbc-438a-b336-1c570c07cc29/33661699207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f9ccbe-3504-4a55-9337-db75295fbd8a/dodepulasisadativ.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_off0000720c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x720C 5648 bytes
SHA-256: 48a1985fc342070279a048318002abfdcd358a1107bf5cbdccca4301f2c00898
font_01_sfnt_off00008556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8556 10612 bytes
SHA-256: cebc3e1e458fe1ff7fb1f09c5a708443b0fc0c3c740624727e2691498057bd9d

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