Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8c85ebc32e5df5…

MALICIOUS

PDF

47.7 KB Created: 2020-10-29 23:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5d54313cc2ea7f216133ddfb205f04db SHA-1: 79bd7c8e94cfeddca8773de140c4a8df42a8ede7 SHA-256: 9a8c85ebc32e5df5407a303d22349c4926cda083e8aec388de3f89fba05e065e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier also flagged the document with high confidence. The document body contains garbled text but includes a URL that is also present in the heuristics, suggesting a lure to a malicious site.

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://ttraff.me/123?keyword=best+buy+dartmouth+crossing In PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/pasefeforumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413370/normal_5f94eb19e69de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_5f96d4c3ea280.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/naluwaputatado.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/2328078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418565/normal_5f9af894ac342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_5f8de4d435f6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f88b87c3501c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_5f92a03650e14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5f8cf5a8aa732.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/c7e5081bc6b95.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/1186242.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/24110154-da7e-431b-a01c-7165f9c71d39/20850968274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2adecf45-94cd-48e3-9607-0f8ac84bd59f/99542080658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b32c9e92-cf71-489d-996a-e1b67347a90d/micropaleontology_foraminifera.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C1 5612 bytes
SHA-256: 6807df3ed25bc5764345d5637867a9fb27e6d4ae6b22a9c56ae001c0ab116074
font_01_sfnt_off000074b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74B2 11732 bytes
SHA-256: 2a3877b64255215fcb341d4a231ca38f2a562eb75f3f0bc431125ad9cbeff065
font_02_sfnt_off00009bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BFC 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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