Malicious PDF — malware analysis report

Static analysis result for SHA-256 8750fb7249bdf710…

MALICIOUS

PDF

51.4 KB Created: 2020-10-06 14:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2180703fd2d68230b66579571f860c48 SHA-1: f8f4cc225c210113e4bb2d04ddab3e38a21da71f SHA-256: 8750fb7249bdf7105081b7106105aaf43027ed5822736b543b2c7e48b7819ec9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://cctraff.ru/strik?keyword=blind+willow+sleeping+woman+pdf+free', suggesting a lure to a malicious site. The presence of many external PDF links further indicates a link farm or SEO poisoning attempt to distribute malicious content.

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=blind+willow+sleeping+woman+pdf+free In PDF document text
    • https://site-1036783.mozfiles.com/files/1036783/60456952087.pdfIn PDF document text
    • https://site-1043752.mozfiles.com/files/1043752/36507665595.pdfIn PDF document text
    • https://site-1038861.mozfiles.com/files/1038861/42882157240.pdfIn PDF document text
    • http://files.alexanderriegel.com/uploads/1/3/1/4/131406604/3760884.pdfIn PDF document text
    • http://files.cindysfeatsofclay.com/uploads/1/3/1/3/131380210/wodemi_toxetoritagow_nobazavobogifi.pdfIn PDF document text
    • http://files.nomorecrumbsministry.org/uploads/1/3/0/7/130740053/5a3da6b8969240.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e4862c75-ac66-4dcb-9d56-01849d993878/nezepibopabizasugatip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3078d4b-b012-4b0e-ae0f-ca89562c9bbf/23707412404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f3b2f0c-9439-4de3-8678-d6ae40242702/ralofowogufigibumilupesos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/396eab6b-bb58-4f3f-aa0f-baa9f1a2daec/nubukun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af1f504-4e54-40eb-b6da-aebfbb3eacd9/tizarupino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7cdcefa-1708-4f5d-8276-a3994b7ba81c/41046225398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd2af2ec-ee7d-49be-8324-36e3cfc993b2/10428256434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c03656b-74f7-4d17-9418-54ec2007675a/wekisepepizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8875eb1-6c79-4eec-b7f8-f6052edd6ba5/48751189821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aab2421-193e-4794-81db-6f89622d1c89/66135647711.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB3 5208 bytes
SHA-256: 5fbac99afacfe852098149f01c56a9e67942bb77552094c2121f097a041a80ec
font_01_sfnt_off00008e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5D 10072 bytes
SHA-256: a34122ec8ee3047fd7ad095914338c1ed2a0b4954ee08159c63fd83d9673db97
font_02_sfnt_off0000b0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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