Malicious PDF — malware analysis report

Static analysis result for SHA-256 088f39b6b349471c…

MALICIOUS

PDF

38.4 KB Created: 2020-10-25 01:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d71bf1baa436e99dc06f91413bb01d03 SHA-1: e6e0bc346231d23d57d6580c980d5dbad616d3ed SHA-256: 088f39b6b349471c11eac3ddb5d5ab57b46fe4d0b643f8cfebd9f09c9fdabade
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which are SEO-optimized PDF documents hosted on external sites. One of these links, 'https://ggtraff.ru/aws?keyword=taxonomy+of+educational+objectives+handbook+ii+affective+domain+pdf', is flagged as known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains a reference to the malicious 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://ggtraff.ru/aws?keyword=taxonomy+of+educational+objectives+handbook+ii+affective+domain+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403938/normal_5f928d7fb7a6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5f8b9c16a9022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374189/normal_5f8fbec55a813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5f877c17ca50e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403264/normal_5f910f2edd12d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_5f8e54acc1a48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_5f8d6a3a62fc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5f88b0e3d6572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384164/normal_5f90cd640cbc4.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/27a48ab9-183a-4452-8c58-adaf5ee8c1c3/nicole_curtis_married_to_ryan_severson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f30532f6-d616-4119-9596-c85d62588013/8130037324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ee76da9-d668-421d-8ee3-4ceafd4befce/49889043926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e27e8e-6e60-43ef-8d02-27cacd98ee37/frozen_soundtrack_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445dace6-c487-490b-8872-4fd2aac24715/batumobawa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/radiology_case_reports_guide_for_authors.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5295/7335/files/61287250463.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2644/7525/files/vokov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2454/0071/files/dodinanola.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/59556046442.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/sunisuzegekuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/du_b._ed_entrance_exam_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/bsc_math_book_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/kijodawinorogovoduja.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_off00005597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5597 5756 bytes
SHA-256: 54b3c25e6f3656efb7ce12ba24fc990793b4e6883f9f42bdc4b38af451cd69ca
font_01_sfnt_off00006923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6923 9608 bytes
SHA-256: 7450c9daa928417be1ce3f93cd304b59e516e1ec15a2a5ae5fe0816b4844a7da

Open this report in the interactive analyzer, or submit your own file for analysis.