Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae459e45dbe1d757…

MALICIOUS

PDF

48.5 KB Created: 2020-11-06 10:39:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19bdd3e5058344e4263418323058b16e SHA-1: 5ccbda09a22a0a954dde5ffdc127a2a2d9b7e9c6 SHA-256: ae459e45dbe1d757e1223270a7d4e03c4aa32422908e3bdc4b2e594d345ba899
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files hosted on file-sharing services. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafffe.ru/123?keyword=picasa+3+download
    • https://wapoxotodizeko.weebly.com/uploads/1/3/4/5/134589696/bebiminewak_nikiwadu_zusozegaxep_sonapax.pdf
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f96b879ac18f.pdf
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/fikulexid_zoxujidepog_pidirizagu_wijivosekine.pdf
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/8002127.pdf
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/288ca.pdf
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/watokifijesomozebef.pdf
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/5404423.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/be7d63f0-b136-492b-96c9-38a9f1bc628b/bawojavoluzurujovo.pdf
    • https://uploads.strikinglycdn.com/files/66136740-dcee-4293-bced-4cb20a50fba2/mizupik.pdf
    • https://uploads.strikinglycdn.com/files/c6d41efd-5c2d-4c46-8987-9c3cde376cd0/40360761951.pdf
    • https://uploads.strikinglycdn.com/files/4f964ff8-6757-421b-8dde-59df9afeb114/38616275366.pdf
    • https://uploads.strikinglycdn.com/files/6aae9842-4bdf-4769-8afa-7731f191fcc0/65806064507.pdf
    • https://uploads.strikinglycdn.com/files/0cc4dc32-769b-4814-920c-7e6d64160a00/17832955687.pdf
    • https://uploads.strikinglycdn.com/files/465ff03e-2416-47c5-83e8-af178b2bef07/98008175731.pdf
    • https://uploads.strikinglycdn.com/files/13963ce4-ccbc-4012-8607-e54e9ddf4fec/signs_and_symbols_sourcebook.pdf
    • https://uploads.strikinglycdn.com/files/8bdd2a82-39da-49d7-9282-c1f276088bfb/crystal_serpent_terraria.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_off00007ff0.bin
6c84185729af7edf8a980c74b3c3642976268c7bf5720b0ee11c0c4d646238f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF0 5092 bytes
font_01_sfnt_off00009165.bin
3f2d638ccc19a67ad7c43c69a537269a1bedfe091c59ed2a8f1d074821191f11
pdf-font-stream PDF embedded font (sfnt) at offset 0x9165 10536 bytes