Malicious PDF — malware analysis report

Static analysis result for SHA-256 7752e9899648a77b…

MALICIOUS

PDF

52.7 KB Created: 2020-10-06 14:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: d525d9ff7fe97a23dc43ef0d5e3afffd SHA-1: 8b91467529526411d88438ff949ea86b711faf5e SHA-256: 7752e9899648a77bf2487a3ed8fcf8d1c532b379ed031aec350733eab53ac930
194 Risk Score

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://gettraff.ru/strik?keyword=in+cold+blood+study+guide+answer+key In PDF document text
    • http://files.enotecaathena.com/uploads/1/3/2/6/132681144/duzapewidekuz.pdfIn PDF document text
    • http://wemanobew.upstagenydanceacademy.com/uploads/1/3/0/9/130969525/lapubodujexu-pejitug-vanutizoju.pdfIn PDF document text
    • http://files.prairieroseherbals.com/uploads/1/3/2/8/132816066/1986858.pdfIn PDF document text
    • http://files.ridgechristiancentre.co.uk/uploads/1/3/0/8/130874489/7131622.pdfIn PDF document text
    • http://files.rijanjewelryexclusive.com/uploads/1/3/1/4/131437931/molewi_tiputu_vewironate.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/6253c995-9c8b-4bd3-ac10-d1d6785a1f96/wadinupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a78460a-4279-48ae-bc5e-60fe3f4f0288/51423060391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f664d014-1363-4f0a-a4b2-3d131ee2e5ab/8569377649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83f7d504-4fcc-489a-9701-eee5664d7527/7521726959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531aeef5-6282-4a7d-9dc9-2f9dc08557d9/sumuvodaguban.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5057e3b-6d6d-47f2-b2d1-38cc534af872/83921919716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9369fae5-aa1b-4283-b8c0-0072fde2f9ab/lejazinipufarixuvuzo.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_off00008259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8259 5324 bytes
SHA-256: 731225aa8d5e7b605414ce96f5e755075355d898bc934d2b0be9264575198719
font_01_sfnt_off00009490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9490 10516 bytes
SHA-256: 0b14c4a50c8303e72cd5bdc53ae22a9962f66ee45b68a3d3e61ed22723830adf
font_02_sfnt_off0000b851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB851 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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