Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8b2a19e74677ad…

MALICIOUS

PDF

45.4 KB Created: 2020-11-01 01:44:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6f37844fdee1b781ae2f7b40b79d4634 SHA-1: 4e0f4c5d7b5cebe03b40d18400d923fa17360cbc SHA-256: 7d8b2a19e74677adc677a52b7d68ffc988538356f180118fcdb7acaf0982e91e
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains the lure text 'Guinea fowl coop ideas' and the malicious URL. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=guinea+fowl+coop+ideas In PDF document text
    • https://sijaxidav.weebly.com/uploads/1/3/4/4/134499987/cfe222bea7d1e.pdfIn 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/b239321d-da50-4bf2-acd7-59cd03759b1a/46948758748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ed51c12-3117-425e-a754-3efa6c66707e/gugusagitirilajopifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f50a9c55-3e6e-4a2a-b324-1a460f81fdf1/65619482151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63e38ed0-0241-4a40-b014-ea8715971b30/13259523732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/748ccdcf-101f-457b-a2ff-120849943c4f/gusozesig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/879507d7-ef75-4ce9-b343-ffcf7dbcb916/63203523352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76e4c08-d19e-4942-8e1a-b3a7f9e3a9e0/joxugigeralama.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/thread_vs_process_interview_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99612204-2946-48d3-b90d-7ca25cf8a97c/41579279601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae080da2-c29b-460b-b8b5-9b48b06621af/rodonukazaredutogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37da79be-e59c-4c91-bc70-08b14a48d86b/mizosexuvokumora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bed761a-38c4-4a98-8689-009b883087ea/46746716400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35ebe4a9-2773-434e-828b-9e33138eb9e3/59895777728.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_off000072cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72CC 5176 bytes
SHA-256: 1a128e423d45e54d3e56f3b3cb6f1d46e6e93fc80e3e3fbb8a39ab7a5902655e
font_01_sfnt_off0000849a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x849A 10676 bytes
SHA-256: 3a707b5a0ac861638baf02d125eaa72d4559667bcc3e97b9e0c2a108aae3f83d

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