Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f16258cb9b4b4f…

MALICIOUS

PDF

41.8 KB Created: 2020-10-28 04:16:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: ce8751e0e146302d3bb7b70be060b759 SHA-1: c858698df5735c764c9a427169866309c8f64215 SHA-256: 21f16258cb9b4b4fa7acf68fd23d47026855ae21b00030c7477eac9a10682658
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://ttraff.me/123?keyword=hotel+empire+tycoon+mod+apk+hack In PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/kezugi.pdfIn PDF document text
    • https://rizowexerezo.weebly.com/uploads/1/3/4/2/134265486/3306663.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/2643403.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/sazagiwe-sulosor-zufezetamedet-suwidojudowol.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/xusila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_5f9654a81a450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f8704869f8b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382194/normal_5f96fd9a1af66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f91fdce184ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5f8720c5dbe78.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000065dc.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000065dc.bin)
    • https://cdn.shopify.com/s/files/1/0483/0275/1905/files/trx450r_stock_top_speed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9261/6388/files/introduction_to_analog_control_systems.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3974/6979/files/zorusodex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/sinister_2_imdb_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cddc327f-3d2e-43b8-9431-47921bd8f64d/46995945543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce13f877-9572-4577-b1a0-fb855f008f94/34515478285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b24101-1032-4c60-8c87-10cd0fe23aff/test_moteur_minimum_interprtation.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/77130338279.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/61367912625.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/gazetabaz.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/mielomeningocele_vejiga_neurogenica.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 extracted file (font_00_sfnt_off000065dc.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65DC 5264 bytes
SHA-256: 9ede71530094a4a66b3634c8a130f1805b2a37fb4041c8d0bd6070e15572f62f
font_01_sfnt_off00007796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7796 10316 bytes
SHA-256: 63709eef4716c9359794d21f29ee475ba11957f55a746f9f8545e0e7f8b7afc3