Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ca95c02f887916…

MALICIOUS

PDF

43.6 KB Created: 2020-11-04 08:27:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 03cb8d6318257dfe6fa91d6af0265ff7 SHA-1: 39ee377845344611f7a4a62cd2bdf9aeae531421 SHA-256: 87ca95c02f887916f18d36e8e5134152bf9ac70c96c73cca1bae3b737bc17dea
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 link that redirects to known malicious infrastructure, disguised with text related to 'Dave and busters franchise information'. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, some of which are hosted on S3 buckets. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

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=dave+and+busters+franchise+information In PDF document text
    • https://dejuxowiku.weebly.com/uploads/1/3/0/7/130738850/6371123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_5f8af4b1ba22a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_5f8998c276a54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f873d06d7ea8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/basifebotezome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8bb46e6-9228-4c3f-860d-06f62a807f71/34740384373.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/lack_of_privity_affirmative_defense.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/microsoft_bluetooth_mouse_5000_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/advanced_mathematical_methods_in_science_and_engineering_hayek.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/sipamenoverav.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/bmw_wheel_lock_key_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f0f3864-bf18-4b5c-a1a1-164d53e31ac3/wigulubupef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4d57dc0-657d-40a8-a5e1-c7e656aca099/29165866758.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/astm_e84_free.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_off0000694f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x694F 5428 bytes
SHA-256: de18640e17c6e5d4dbecd5aba6491e40416bf8ce320850bb0c3ebe91ebd46efc
font_01_sfnt_off00007bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAC 11132 bytes
SHA-256: 21d8b82e8421f65b62a6539f52a927b93416a99601b0deead7eb2e0b87a75025

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