Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ec9804a7509f91…

MALICIOUS

PDF

41.6 KB Created: 2020-10-29 06:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d9c906b0c51310fbed348d88db63323 SHA-1: f32038b7aaa8988fd212efe3f46ee534ace3bfcc SHA-256: 78ec9804a7509f910f8f9d77a68ee64e0d4da43cd46cb7b497868fbfcfb6fa13
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 a link farm designed to manipulate search engine results. One of the primary links directs to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The ML classifier also strongly flagged this PDF as malicious.

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://cctraff.ru/strik?keyword=new+nc+notary+manual
    • https://cdn-cms.f-static.net/uploads/4386822/normal_5f91f5881f391.pdf
    • https://cdn-cms.f-static.net/uploads/4372696/normal_5f9141e0b6740.pdf
    • https://cdn-cms.f-static.net/uploads/4379221/normal_5f9397227e2e7.pdf
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f86f660dc18f.pdf
    • https://cdn-cms.f-static.net/uploads/4420910/normal_5f9960129fa87.pdf
    • https://cdn-cms.f-static.net/uploads/4404503/normal_5f9181455969a.pdf
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5f8cb07421f1e.pdf
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5f93ab8f01bf8.pdf
    • https://cdn-cms.f-static.net/uploads/4379233/normal_5f8cc619aabc9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7a8dc73e-5be2-483e-848e-03cab36212f1/best_softball_outfield_positions.pdf
    • https://uploads.strikinglycdn.com/files/6704a842-9afe-4987-ab3e-768bc980a17a/tuvexuwobubariwunatewowik.pdf
    • https://uploads.strikinglycdn.com/files/d0eb8097-823e-4aac-8896-da8447db19c6/kukisoxepolata.pdf
    • https://cdn.shopify.com/s/files/1/0503/1696/8103/files/locke_and_key_screenplay.pdf
    • https://cdn.shopify.com/s/files/1/0431/5932/2778/files/22537261144.pdf
    • https://cdn.shopify.com/s/files/1/0484/3490/5240/files/audio_technica_gaming_headset.pdf
    • https://cdn.shopify.com/s/files/1/0266/8045/9456/files/forensic_toxicology_journal.pdf
    • https://cdn.shopify.com/s/files/1/0497/5978/1023/files/konabenakis.pdf
    • https://cdn.shopify.com/s/files/1/0499/8565/0848/files/zapya_apk_free_download_for_android.pdf
    • https://uploads.strikinglycdn.com/files/439181ce-59ae-4bbd-9ac6-740c29685ece/resaxesekon.pdf
    • https://cdn.shopify.com/s/files/1/0431/3455/0177/files/31652697363.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062d0.bin
5c1195e8e2cb1a8b2a5980790ae15b97e831c0dcb71f2c5292ea83c32a2afc04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D0 4928 bytes
font_01_sfnt_off0000739d.bin
b13ab13e69b4c859b6644f8ad842f3293bf96071584a8129f03c946bfa31a7aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739D 11380 bytes

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