Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4bbcbb1f8229ba…

MALICIOUS

PDF

47.7 KB Created: 2020-10-26 14:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b11f47f201a5c66b5902e9b7a66157bb SHA-1: 7604ca59b2e9f09a5038f088c304faee4566ac35 SHA-256: db4bbcbb1f8229bac5f00110905cefae300f2c265a788235b63d27029496b092
184 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the list of extracted URLs, reinforcing the malicious intent of redirecting users to potentially harmful sites.

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/wb?keyword=negative%20impact%20of%20social%20media%20on%20youth%20pdf In PDF document text
    • https://vejuvofarazaxar.weebly.com/uploads/1/3/4/3/134355137/komoxuzaxum_kuzof_rakuretewav_xafujenewen.pdfIn PDF document text
    • https://simejozegedofu.weebly.com/uploads/1/3/4/3/134359486/jefawovovad-sozezeruxinelax-doseluziwe-demarifofura.pdfIn PDF document text
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/8088835.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/3049493.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/pefuwe.pdfIn PDF document text
    • https://jawifimubagibe.weebly.com/uploads/1/3/4/3/134310986/9586068.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/3246994.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/1039323.pdfIn PDF document text
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/ce2a1618b.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/9310617.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/1/0492/3906/4742/files/undertale_fan_games_unblocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5129/2584/files/free_algebra_worksheets_for_grade_6.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6773/6225/files/paradise_lost_poem_analysis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0806/4677/files/tamu_bus_routes_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b988446-101b-43aa-9c76-289671d5a33f/19178733120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3752c4b6-a562-449f-8b21-820d09b0ff33/55668410943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e98aa9b-4ce4-47f2-b3f3-841906d0d953/membership_policy_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d3ca94-6b82-4609-acf9-ab2c0bf5caec/unifying_features_of_archegoniates_p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da365a4-428d-40e9-a5e3-5e9b6e7dae54/41213977960.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/fakolup.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/hbse_class_12_syllabus_2019-_20.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/tokalukununeguwexiwari.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_off00007bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC0 5604 bytes
SHA-256: 9813561a2fc4c1053dcd689e3851802da7dbea6deb9f3fe9330aae431829a760
font_01_sfnt_off00008ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBC 10028 bytes
SHA-256: 05328eaa063f0d8c7096e29066b76415e370dd6939c954b8f078a1f5fc9bda59