Malicious PDF — malware analysis report

Static analysis result for SHA-256 a716518aa6512d96…

MALICIOUS

PDF

46.8 KB Created: 2020-11-03 15:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a72df4fe29a88f44feac928edcec18e6 SHA-1: d5de48817aece79d3551b3c5f4e8087109824928 SHA-256: a716518aa6512d96943e3ee325baf3ebb1a7cbc0e27575135badf8baf092ca4d
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 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://cctraff.ru/123?keyword=willamette+week+gift+guide+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414847/normal_5f968b5c2a8de.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/porukofosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5f994aaf4a3c5.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/f813cd9e-fd17-4437-afb5-d9ff6a596171/85528904005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebe2caeb-c795-42ab-bed8-51a2f6de2e6c/pegezinabaziluvibobuso.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/embedding_a_gif_in_a.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/95906902373.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/coronilla_de_la_divina_misericordia_acordes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee342930-9180-4d18-b267-b8800998e8f5/dokkan_battle_upcoming_banners_global_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/snowmobile_manual_transmission.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4793cb7e-b75c-4091-8efa-9a21164f25c0/gradpoint_answers_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9717e36-67f1-4ae0-af2b-bd220baceabd/88107631680.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/wutaletumozuwobano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/690e4d16-4dda-4a3f-8e85-4d94ef652ca8/lack_of_resources_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/flex_modification_program_freddie_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9044e468-abf2-46b9-850d-cb6e09461351/64168150242.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3D 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off0000757f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x757F 5604 bytes
SHA-256: d40333b5807a9c859162885658c6a3572b0bbb35b0154f16bca4a5434904b000
font_02_sfnt_off000088ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88AB 10924 bytes
SHA-256: 1516971551ca16ae855081baac45c725bcc3c444ce62c9e7c75503404d57cbdd

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