Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c81150e3df0dc6…

MALICIOUS

PDF

67.3 KB Created: 2020-12-19 19:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a6c26bcbc80584f74b5b6b115e5aaf6 SHA-1: 7bc4189464793e6cd0ae9ad59c7ecf593f3777f2 SHA-256: 56c81150e3df0dc64debdd267b25367f65f955cd0ba4243847adc7fd7b517000
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM'. The document body, though heavily obfuscated, suggests a lure related to 'Video baby shark original dance'. The presence of external links and the ML classifier's high confidence indicate a malicious intent, likely to redirect users to potentially harmful websites or engage in SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/aws?utm_term=video+baby+shark+original+dance
    • https://cdn-cms.f-static.net/uploads/4382197/normal_5faf0d39aebc1.pdf
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5fa5df2ccbe8e.pdf
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/ffc40040a9e2.pdf
    • https://static.s123-cdn-static.com/uploads/4378170/normal_5fce857d37335.pdf
    • https://cdn-cms.f-static.net/uploads/4489977/normal_5fd973bb42511.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/92352b8e-205d-4537-a5ad-5700d9a446f6/can_you_save_a_google_doc_as_a_word_doc.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5fa34f98375720d7ecad/1606377379723/komulifuwolajodibij.pdf
    • https://uploads.strikinglycdn.com/files/838c7f18-cf84-433e-93f6-d49f9e9382c9/the_brand_new_testament_watch_online.pdf
    • https://uploads.strikinglycdn.com/files/ca7b3885-6a92-470e-a327-d540403c56cb/quantos_multiplos_de_5_h_entre_21_e.pdf
    • https://uploads.strikinglycdn.com/files/57b700ba-cc76-453c-a077-e8745bce2f3c/southern_pines_womens_health_center_southern_pines_nc.pdf
    • https://uploads.strikinglycdn.com/files/55aa55c4-82ec-4862-bdc4-3393ec519023/35209642221.pdf
    • https://uploads.strikinglycdn.com/files/e4caa87d-ed98-4081-b6fd-3874ac245de8/77736348233.pdf
    • https://s3.amazonaws.com/sefepugolupalax/dovusukijijuwed.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_off0000c937.bin
ac19d67451823d7c5055922da7f0e988f1b72714aaa54f1387f2c9713b96cd86
pdf-font-stream PDF embedded font (sfnt) at offset 0xC937 5472 bytes
font_01_sfnt_off0000dbd2.bin
ae5e22411dafb65bc8c1ccd6f6a2d3fd239e81fafd4807c9753c578aeef69328
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD2 11088 bytes