Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03985ab9626931f…

MALICIOUS

PDF

40.1 KB Created: 2020-11-04 04:19:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8aaa5593619979260fd6475ac8604964 SHA-1: fcb4157d22d0d9384a5a0ae7f4dcd08f9696ec2a SHA-256: b03985ab9626931f3c37a8e2e4b54e62194643869dd298578cd283897a339779
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. The presence of numerous links suggests an attempt to drive traffic to malicious sites, potentially for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/123?keyword=information+processing+cycle+stages In PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/sinaduwegeta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f917baa47dde.pdfIn PDF document text
    • https://ketawajizaw.weebly.com/uploads/1/3/4/5/134528489/fidepipafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369802/normal_5f9f957feb871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f8be5da1ed23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5fa11d7889789.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zetare/satiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e00271-8ba2-48da-b45c-a9184273f110/xakakosifebesezir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2678230a-d118-4f4d-98b4-e4cb434dff76/84211752358.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/galojozavumeguzidomovi.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/panasonic_viera_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/latajimukewukiziw.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/guide_gear_thinsulate_jeans.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/worksheet_5_probability_addition_and_multiplication_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/kidugodofunose/soulworker_soul_sequence_locations.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/53371012664.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_off00005f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F04 5376 bytes
SHA-256: 31b00b34e26bf1471ba5b476a7248dd9b015e8f561ca0b2218f5d7e940c574f7
font_01_sfnt_off00007141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7141 10036 bytes
SHA-256: 37bf3d5e3a0c331e567f85e2c636138282d82b6e95577f996a659cb6113c260c

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