Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8fade80a5446c0…

MALICIOUS

PDF

48.6 KB Created: 2020-10-27 00:24:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eacc8333b61778be17f1b005f4515f91 SHA-1: 96d46e65558842d67287b102165d41e9f37dbc6e SHA-256: bf8fade80a5446c0b96847bca3101f573400df3c831691d5873b465914adc359
184 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, many of which are identified as malicious redirectors or hosted on disposable domains. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to drive traffic or potentially phish users. No scripts were extracted, but the presence of numerous external links points towards an attempt to lure users to malicious 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://ggtraff.ru/123?keyword=best+open+back+headphones+under+200 In PDF document text
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/1287566.pdfIn PDF document text
    • https://ritewelikuwu.weebly.com/uploads/1/3/4/4/134493798/dbd2670.pdfIn PDF document text
    • https://ximinelinax.weebly.com/uploads/1/3/4/3/134313791/fekik.pdfIn PDF document text
    • https://buluzuzumaz.weebly.com/uploads/1/3/1/6/131636727/6110784.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/6263159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_5f8ef5b999569.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374843/normal_5f91219140880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f87b585325f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372086/normal_5f89b1459d869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382413/normal_5f8f5c173a882.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/8030446.pdfIn PDF document text
    • https://wiwawuvagowe.weebly.com/uploads/1/3/4/4/134496439/cbc3245893d.pdfIn PDF document text
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/15ba21d21caf.pdfIn PDF document text
    • https://mupififidimob.weebly.com/uploads/1/3/4/2/134234858/6651022.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/wugukokedomijis-xizob-xejivab.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/ebc945dc-db77-49ff-a8e6-c50895d34e55/13263148761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d656d52c-c755-4c9e-9d5f-cb3a2d9147fc/25453562340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2d3082b-4436-49f9-a7df-b1cc8294d0c0/xododidot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/667a8f49-37a9-431f-af7a-de4752b70432/vemaxemoruzokepezoket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5cced72-4073-49eb-8041-565de9ab9123/manufacturing_extended_fallout_4.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/arqueologia_de_colombia_reichel-_dolmatoff.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/48023131415.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/tout_sur_l_astronomie.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/santos_bonacci_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cefc6c0-8e18-47b4-a3a5-09d595e6814b/39721596775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0550b77-5573-432b-96f5-96c4173eeb71/52165203196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2e269a3-40d6-426b-95d8-f9f786752a2b/petesemidotubetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9413712c-0f46-4b28-82b7-b272d5e04050/juzatibijitotonipiruzov.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_off00007d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3B 5656 bytes
SHA-256: 97f50196e2bc5f791c677ec315e891307a7bb26f721ca5c796294a644386481f
font_01_sfnt_off00009062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9062 10548 bytes
SHA-256: 097b506c54ac0fff60f0ebad8adb2a90faa6919f20ae5fd5fb5a7c7ec0700270

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