Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc222efbe6017f4…

MALICIOUS

PDF

37.4 KB Created: 2020-11-03 09:39:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f58d7b5a0518c6864554887eb0b66f26 SHA-1: e609cbbb0e67c2f38152a73a3144f62091ba02ab SHA-256: 8dc222efbe6017f43b48227d26e5d7e665671a56df11812560891b562cc7b1c8
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded URLs, with one identified as a malicious redirector (https://cctraff.ru/123?keyword=i+don+t+even+know+2+poki). The presence of numerous links suggests an attempt to lure users to external, potentially malicious, content. The ML classifier also strongly indicated maliciousness.

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/123?keyword=i+don+t+even+know+2+poki In PDF document text
    • https://vufizirisabewi.weebly.com/uploads/1/3/4/4/134443644/tewibinel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d50e79-ebb4-4f4d-a8a3-0a979567cdaa/xenozowowotokovezozami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd3a1fc1-3293-46dc-88b0-50cec6a676ce/23808357372.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7633/8335/files/port_townsend_ferry_schedule_to_victoria.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/scale_drawing_problems_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7727/8627/files/combat_4_unblocked_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/866368b5-0ec1-4066-bdbc-a2f95425bfd1/lovatafewowaru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7927/9795/files/duluth_public_schools_superintendent.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/7187/0376/files/wrangler_boots_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff6b02d-52da-4293-93b0-dae9b439a00f/sivodixuwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8292/2181/files/physics_classroom_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35fb0b5e-6c8f-4572-93f5-b3bf264e786e/74407607968.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2335/4021/files/vibemilipirodoxeguvo.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_off0000556e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x556E 4724 bytes
SHA-256: f8e6a44b6aad6e29d7a649585e167e097c7cc454e931314ebce56a68b787ad18
font_01_sfnt_off000065b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B5 10412 bytes
SHA-256: 76e9f1a0e02959ce2088fb512d808119e2160fdaccdb30a04dd3de12f6321b32

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