Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceed122743c0ae60…

MALICIOUS

PDF

39.8 KB Created: 2020-10-29 03:15:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 34306548d7ad1fc0eaf73b17f69d7711 SHA-1: e2da10756df1ffa503cc51d6a8271b61e6630c68 SHA-256: ceed122743c0ae6005af4420c9659a2a93845824e866be572fe3ab12562c106b
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector services, indicating a link farm or SEO manipulation scheme. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are also present in the link farm.

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/strik?keyword=minecraft+mods+1.8+9+carpenter%2527s+blocks In PDF document text
    • https://ruwalabipuges.weebly.com/uploads/1/3/4/4/134465281/f11f4e303d.pdfIn PDF document text
    • https://panirosarukiza.weebly.com/uploads/1/3/4/1/134132539/5982633.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/5703209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385633/normal_5f90152b81751.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/1828606.pdfIn PDF document text
    • https://setekonireza.weebly.com/uploads/1/3/4/1/134131298/5df12f93dbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412890/normal_5f95244e87d6c.pdfIn PDF document text
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/735f13bf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5f95503670717.pdfIn PDF document text
    • https://lujadogube.weebly.com/uploads/1/3/4/5/134522393/fovowebon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380530/normal_5f90dd7aa3b5a.pdfIn PDF document text
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/3171836.pdfIn PDF document text
    • https://pirivelel.weebly.com/uploads/1/3/4/5/134505874/5109176.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/1/0499/3826/8318/files/texilatibesipivukonowar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6e07e4-d2cf-43bc-bef3-227df9419b12/vonafezisudo.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/mufiroxutirixonadulozufev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/speed_back_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/miami_rescue_mission_clinic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990621d0-3775-4c1e-8842-15a47d783116/xujuninajaziga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4aea1e-8fb8-431e-b058-a873df8e40b1/borozupegu.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/zubiwufi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/9246/9669/files/if_heaven_and_hell_decide_chords.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_off00005814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5814 5980 bytes
SHA-256: 8a8530dc28d07e9785070a35a78c176a2c51c4cc7f3691b1e03e4fd438746d71
font_01_sfnt_off00006c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6E 10316 bytes
SHA-256: a0c223be063617eea9aa76012accab0450d67aec3c82c78853d1d54217d1b2b9