Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ec6949ba04d35c…

MALICIOUS

PDF

45.6 KB Created: 2020-10-16 10:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4033c1c7a0545df6619be4140438c13b SHA-1: ee4b565a109f2983c2dc140b342ae5dde41d02ea SHA-256: 58ec6949ba04d35cad4e6702479324b445834d1cd94e486cd8046eb33d88850f
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure (ggtraff.ru). The document body, though heavily obfuscated, contains text suggesting it is a government style manual, likely a lure to encourage clicks. The presence of a "download button" heuristic further supports a malicious workflow. The ML classifier strongly indicated maliciousness.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=united+states+government+printing+office+style+manual In PDF document text
    • https://nesavelo.weebly.com/uploads/1/3/2/3/132303009/6750790.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/2833280.pdfIn PDF document text
    • https://jabiratunibi.weebly.com/uploads/1/3/2/6/132683422/bc00e3fac5bb8d8.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/movew.pdfIn PDF document text
    • https://lifagixuwemup.weebly.com/uploads/1/3/0/9/130969738/kosoviwubifano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f891780a4655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5f8905a0d3393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f872eb741e78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f8724fc843f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5f8946c3e23f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f8948e0e2a01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_5f8778dbe616d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_5f8920354f9cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5f870ee18cdb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_5f879f357d218.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/5f99297d-b442-4e67-a1ad-64858f51da2f/fovafikunovozeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11b6bf75-60cc-417b-8d4c-b4fbfc72b5c5/nuwakobaxofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78fb1209-b0a3-44ee-b380-8b26a9789d78/tefeserawuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/890f509c-43af-4efb-adb7-554b6ec14dc6/57188378139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb025ad-3c74-46e5-8eda-61daae509358/doduvigusalubutusozotofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29edec9f-8ba8-4647-b7bf-f812518c7b80/21544720487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a973b3-6ed5-45ee-a840-bd1dcbce36a1/4550005186.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_off0000719e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x719E 5628 bytes
SHA-256: d735d89e06a0131f33f07c307068ee81fb2af41cf9e64f3582e032eba064ddc5
font_01_sfnt_off000084ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84BA 10564 bytes
SHA-256: 8288367098bff205ccc6e06a756d2521859f656cc4637f381ba2bd8bf1633996

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