Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b08b653524b9e4…

MALICIOUS

PDF

49.2 KB Created: 2020-10-25 16:36:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 083f1b5edc44d76c783f94a8fc791219 SHA-1: 8ca066f4fe890b1839c5149bb4297ca0c3c7b1c1 SHA-256: 71b08b653524b9e4f1eae778c465c78f1ab6884e0418e9cc1bae0fa0a6dea252
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and a known malicious redirector. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to redirect users to potentially harmful content. The document body itself is heavily obfuscated and contains embedded URLs, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.com/123?keyword=hp+compaq+la2205wg+manual In PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/b21c0d5dc0f77.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/6171.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/selagu-wugixinoxule.pdfIn PDF document text
    • https://wudizibi.weebly.com/uploads/1/3/4/4/134477582/rubovolesig_pexumanibu_velako_pasovalufo.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/1000608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_5f8cb87975e7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_5f8cf46ec220e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_5f93bd25c0c7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f936c7843354.pdfIn PDF document text
    • https://morozosewiveloz.weebly.com/uploads/1/3/4/3/134387595/puzofiwaxowik.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/e58d56a7ceed.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/vojasu_dinitemadez_julevu_sejer.pdfIn PDF document text
    • https://jederatikepu.weebly.com/uploads/1/3/4/3/134370591/kijurazagu.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/2501269.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/1983e970-41c5-46fd-ada4-04caab0c442c/6342655892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58504f8-6004-40f9-b6ed-29448cb246df/lofegatexafixexirawuveso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd260e1-49a8-402e-8c4d-d1eb04137314/87609716488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/306786a1-6b1f-492f-9985-25ca35e8dcb5/tupaduxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/7591/1847/files/english_worksheets_for_7th_grade_printable.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/5470/3004/files/57889879327.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6343/5679/files/tevukojolozopufutirof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3864bb45-1f6d-494d-9cf6-d00c06d86b4a/bizokikagopori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d09c793-5d04-45b5-9199-e67971203b9d/76732304836.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_off00007fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC2 5556 bytes
SHA-256: adaec67f769f6d5e400a3fb37c3579412da4a381afc204a94ab8b3c12c498bf0
font_01_sfnt_off000092a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92A9 10824 bytes
SHA-256: 0ddf6e7eab9b277e6eeaaeb6176af5480b4b3b542765b9134d087c640716b34f