Malicious PDF — malware analysis report

Static analysis result for SHA-256 abe4c9c2e3124f5a…

MALICIOUS

PDF

35.7 KB Created: 2020-10-12 05:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 7c9ac400f51b008ad149c25c51614264 SHA-1: 7bd40e66c448844f90741423b9d2421509cbcef0 SHA-256: abe4c9c2e3124f5a153905de2ffb7ec4a31231b0665faf6daf1658684594eba6
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, suggesting an attempt to lead the user to malicious content. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics and IOCs, reinforcing the malicious intent.

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.me/pify?keyword=cpt+code+book+pdf+2017 In 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/ebe52383-f9c2-4c30-81cd-371022458ec6/80563197868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e76efcc-b51a-4279-ac22-07e17a954659/ruditanilifexonajogesesuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/494bc8a1-4a53-4a18-9113-97548e86d787/88859044990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c261c0fb-afe4-4711-b745-01419b450108/60418583577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1045afcb-201e-481d-8f16-fb69b311ee44/15703809650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/272f8e82-4d33-4401-9671-35ee2206e0ab/13606547136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ffc88bc-16ec-4f4b-918a-b9fa4029c600/73649778114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a187112c-32d9-4f53-8c9c-cb1041149212/lunagejefidubemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c8aa8b-dd07-454f-9eeb-3095488ab2be/fonirudokosadegev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eed6266-d3ef-4f7d-9638-c9b255b3f03c/pexigivipozuwuwizetat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5430e469-da22-44c6-9193-1e3db6413a07/97770624636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/438c11fb-f2f0-49fc-a53d-087f91b31e33/tolowezoxuzunuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/9574/5446/files/rikke_hat_pattern.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8565/4944/files/van_horne_iowa_library.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2371/4464/files/33694581322.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3384/4119/files/wutamazasi.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_off00004e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E50 5148 bytes
SHA-256: 157af35ac72423a27329e193fb0056d4aad3b728d5ea0f81eaa9d4896739ce66
font_01_sfnt_off00005ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFB 10116 bytes
SHA-256: 94022e89750c41bc556a1e46c8a8a74390e9c47ec82f7b48395700e8de047898

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