Malicious PDF — malware analysis report

Static analysis result for SHA-256 624d9e8cf73f802c…

MALICIOUS

PDF

143.0 KB Created: 2020-10-30 17:15:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fece4b0fffdda8ca0f566e89f9882574 SHA-1: d374cacefa6ad212efedc3a3c256d661b27bbf89 SHA-256: 624d9e8cf73f802c7bb62e29688e016c80410c144f5286c332bbdec0eecc6cbe
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 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://ggtraff.ru/123?keyword=debonair+220+thermostat In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5f8ce1b3bc83e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403946/normal_5f98749b86da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384468/normal_5f99079dd2a78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_5f95130c56e61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5f89acde1ad50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_5f8f367c2bf05.pdfIn PDF document text
    • https://dugegedop.weebly.com/uploads/1/3/4/3/134338267/82f8e3157.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/8742796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403940/normal_5f9b7320d18db.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/49eeb478-322f-4482-bfbb-566116ae643b/23073778146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e2d32e7-f09b-4bd9-9671-5d965a460f84/gokonegavolelamimepisu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9000/8994/files/does_chase_bank_sell_iraqi_dinar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3015db1a-9944-4538-ab0d-a53395e663cd/sopudasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c74c60a0-063b-4ff8-9c29-64dac62e0fcd/integral_por_sustitucion_trigonometrica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4f3f969-24b3-46b0-b8a3-f1e700e4934a/38828830493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fafc700-bc16-44c6-bb49-5c8ac48fc660/51758854831.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_off0001e982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E982 5096 bytes
SHA-256: 56cb19506b3086ab76e2667b4a3e47d4ab38d9291dfcf41c8472028070b44118
font_01_sfnt_off0001fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA99 11220 bytes
SHA-256: 1bfff67685a717037e0d300660a0b9f248bf3b7819afede54591f08d19466347
font_02_sfnt_off00022048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22048 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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