Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bb1ea0233d7a3e…

MALICIOUS

PDF

52.2 KB Created: 2020-10-25 08:17:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: dfa64818938c7c2f671206c975c035f4 SHA-1: d82d945435548215f31db5b14c2c1b2d77e52e70 SHA-256: e1bb1ea0233d7a3edb6a5baf0b189ff1118164517aa4e601d38a5380e316a6a9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 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://ttraff.cc/123?keyword=hotstar+premium+mod+apk+v8.6.6 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_5f8f3f367c84a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389571/normal_5f93c919daa94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393183/normal_5f9092f99cc96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f87017bee5c1.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/funajedoweruf-bawikaroza-niwixem.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/bovudefomuleb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f92dc1652bf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_5f9250fd5379e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371240/normal_5f8a9dbe8257b.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/nojof.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/da1c2797c91.pdfIn PDF document text
    • https://ralerafuzirepob.weebly.com/uploads/1/3/4/3/134386916/2030e7ce8d84601.pdfIn PDF document text
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/gazokavo.pdfIn PDF document text
    • https://bujegeti.weebly.com/uploads/1/3/4/3/134355457/wofiruvubexoluvuva.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/c419a48d-2a28-4727-9ff7-bc81ae6b3c5a/39563861622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a4fff5a-1d85-4d74-9e1d-4aeaf5cf24e8/relier_un_rapport_de_stage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86e11c20-f9cf-458b-b204-3b809edc784e/matar_a_un_ruisenor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0799dd91-a239-4193-b903-9f65b9cfa45e/devuvexuxidiwupatipami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76edd0d2-4d0e-44d5-b8cd-e7233decf585/gilalajefutuvi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4440/5397/files/video_volume_app_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1070/6619/files/gobesiludebolipawemaruwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9198/3013/files/mebumox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0613/8787/files/product_development_process.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000755b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x755B 5536 bytes
SHA-256: c6f8dc38fecafbb44da0fc688e652d35d727c6b9f3a9c0aad02a5f224867d050
font_01_sfnt_off00008824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8824 10912 bytes
SHA-256: 81c8c7bb3b8e5a8065c82c7ca5ef8a0e3a40c830a8237ea5752631d770cd0f16
font_02_sfnt_off0000ad87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD87 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6