Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9f26c33ef02bc0…

MALICIOUS

PDF

31.1 KB Created: 2020-11-05 17:10:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9f995ec2881cdc4f98c67955d9cbe8bf SHA-1: 0a9f000a5218d2054f37407619d53937f6e1a5e5 SHA-256: 7c9f26c33ef02bc0f76e14ab260f98006f4521480273baf0672ea46a3cbee2a6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file functions as a link farm, containing numerous embedded URLs that point to other PDF documents. One of these URLs, https://gettraff.ru/aws?keyword=osu+physics+1250, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness, suggesting the primary purpose is to redirect users to potentially harmful content or facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?keyword=osu+physics+1250 In PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/7581627.pdfIn PDF document text
    • https://tilawebaxipas.weebly.com/uploads/1/3/4/5/134576196/xidodexal.pdfIn PDF document text
    • https://xezinazilasiza.weebly.com/uploads/1/3/4/3/134319357/bugaruv.pdfIn PDF document text
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/c36f8.pdfIn PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/sevuvevimuferijobaxo.pdfIn PDF document text
    • https://kumupesefutevun.weebly.com/uploads/1/3/4/4/134463509/nogozekugo.pdfIn PDF document text
    • https://gozekukapitob.weebly.com/uploads/1/3/4/4/134443516/2885495.pdfIn PDF document text
    • https://modatubegawaso.weebly.com/uploads/1/3/4/4/134491319/6283581.pdfIn PDF document text
    • https://nulosogitizibe.weebly.com/uploads/1/3/4/3/134317173/vepudifosisu-wiwive-rumakoletale-bafop.pdfIn PDF document text
    • https://misiwutikamiba.weebly.com/uploads/1/3/4/6/134601431/98d0ff6ecd.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/a59bfec6-cf99-41a3-981e-aa80aa283af3/inotia_4_black_knight_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/715a2f92-12c3-489e-8db9-66705f51199e/lagibaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f4ecd05-be54-4d0e-883b-187f696a72eb/fozokarejesijif.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/nafofirinojibuwesejik.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/53022779872.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_off0000408c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x408C 5260 bytes
SHA-256: 047e77b82fe345a658896e42e6bc47820fb94e021bcd14dd14fb3196163f7bfa
font_01_sfnt_off0000528d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x528D 8636 bytes
SHA-256: 2cec7b41f3e00fc351c20219d055c0865655bcabdb0420a2e72676d6e6f69228

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