Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73bc8dc17c42517…

MALICIOUS

PDF

41.7 KB Created: 2020-11-06 21:10:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 36d9bef9b9cebe9095895366eb7f73e9 SHA-1: 1c79e14e402668ae89497c3bf85c1f61aeca9efb SHA-256: a73bc8dc17c42517147490c568b8d7fe06677dd9642820e146a92911941686a3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. The primary IOC is the malicious redirector URL.

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=wiki+codes+for+ro+ghoul In 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/6c89d856-195a-4814-921f-a439b12bd579/82885864566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a628751a-1be8-407d-af3f-4bd75abd9963/project_zomboid_traits.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/patalizipugek.pdfIn PDF document text
    • https://rozeduwe.files.wordpress.com/2020/11/a_view_from_the_bridge_full.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/42731383769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35f36e4d-7a23-40b4-8ef5-9d1d5eea5bdb/auvio_speaker_hbt2000w_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/architectural_symbols_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/82474209476.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/lemisezadat.pdfIn PDF document text
    • https://felibule.files.wordpress.com/2020/11/wanojuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22a0541a-74e1-4613-90be-3d445b3a6c46/jujivenipuxilem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04ec0d4-64ae-4181-b71d-852413e864c2/kimefuxuxewiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c930fc5-55de-489c-a5a2-15742804db23/5893027752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c24167-4b40-42b6-8c54-84cd2843e1d6/33929374459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d80fd5-0de4-45a3-be9d-0239d24eabbc/plant_reproduction_worksheets_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/kosulobewugekeguxofipaw.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/95178405720.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_off000062cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CD 5148 bytes
SHA-256: 06bcc9ee2dd3fe73d74cd55cdb10b4f8c8caf9beb349027ef45fc3883409d9f0
font_01_sfnt_off00007460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7460 11356 bytes
SHA-256: 3ac44bfef29524cff4aebedb372bcef094e9b029d2a48b9e37a59b5cca878af3

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