Malicious PDF — malware analysis report

Static analysis result for SHA-256 1625f1f3f99d137c…

MALICIOUS

PDF

40.7 KB Created: 2020-10-31 00:28:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c46937187a6df13e98837de6fe759a4f SHA-1: 38e4f2e67236356fb7e988033d5322a307e20431 SHA-256: 1625f1f3f99d137cfb287c88af0d8308928884eae9ee3acf79c8ee97015be140
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 point to external resources, including a known malicious redirector. The document body, though obfuscated, contains references to '850 area code texas' and the malicious URL, suggesting a lure to a phishing or scam page. The ML classifier strongly indicated maliciousness, and the presence of numerous links points towards a link farm or redirection strategy.

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.com/pify?keyword=850+area+code+texas In PDF document text
    • https://tenagudewujuga.weebly.com/uploads/1/3/1/1/131164273/d707d788a78.pdfIn PDF document text
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/9223751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_5f9ae0d35afe4.pdfIn PDF document text
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/bb86ce.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/guxosa/fixubilujilatotugumedaret.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/kirby_air_ride_checklist_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/scjp_kathy_sierra_java_8_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/bivomer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80818761-471d-4dc5-a739-3252c9dc76bf/43975917814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48354a83-6b0b-498d-b7c8-d0afefcde920/zozon.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_off00005f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F45 5336 bytes
SHA-256: 8ccf3e402d931712465c161b5310106c6fb0e32350a66ccfd555d716b86cea1c
font_01_sfnt_off0000717c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x717C 10932 bytes
SHA-256: a1d6de654ca1d5657a05123929642e36c08bd64082c9960a09d968a38c168767

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