Malicious PDF — malware analysis report

Static analysis result for SHA-256 89520839c06f0dd9…

MALICIOUS

PDF

42.4 KB Created: 2020-10-16 17:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 80d82ee18f96194c1acddf40cbc69bd7 SHA-1: a091742e639af91a1e66b0adac71dd063e301982 SHA-256: 89520839c06f0dd998487adab4ac6fd525197bb3c165b0273c6c8706c99659c6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure. The primary link identified, 'https://ttraff.ru/123?keyword=microbiology+text+book+pdf+download', is flagged as malicious. The document body, though heavily obfuscated, contains similar text, suggesting a lure to download potentially malicious content disguised as educational material. The presence of numerous external links indicates a link farm strategy, likely to distribute malicious payloads or phish for credentials.

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.ru/123?keyword=microbiology+text+book+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_5f88cfc959f03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_5f879e0365312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5f8983ce5d3c9.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/nunekiz.pdfIn PDF document text
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/324447b189434b.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/e9ff54.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/3435164.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/7819088.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/chemquest_19_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4645/2899/files/75288283128.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7670/5690/files/there_is_in_asl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6172/2786/files/wezaliteziwopodaxukojag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9432/7974/files/persona_3_maya_shadow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/4093/8410/files/jojavokabikaboxevoni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4981/8024/files/wekajilurugulov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0250/5633/files/jonajuromafizadawokudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c65f699-c1dc-42db-8faa-ca39968f1c4a/durikegokoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3665d63-4936-49b2-b377-7818c8c6214f/43323245256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/928e5ee9-3c2b-43fa-8f1f-13f0aa2e9493/sawekabigoselegefugevow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a90914-b83d-421d-8c52-789ecdef5c8e/1183990369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57206012-18fb-4315-9ae3-342f86996b8b/ranilazo.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_off000066fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66FD 5616 bytes
SHA-256: 2540b2d442f41865ce0902be5c18abe529a6ec350dc7d369ab435eca6bd9d7bb
font_01_sfnt_off00007a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4F 9888 bytes
SHA-256: 6c37af80067f2b52e79563faa27edd0ca7856c06332d7649bc6d1071d11597fc

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