Malicious PDF — malware analysis report

Static analysis result for SHA-256 31de6e609d2361a1…

MALICIOUS

PDF

44.7 KB Created: 2020-10-27 13:56:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a6a31654f9f5a6cf818e738d32af792e SHA-1: 9bbb471e25ae022268c81b28c4baf447bf8e97c8 SHA-256: 31de6e609d2361a169a66a1332b55c81acdfd7aebea2f31c0321ee9fbd7f90d7
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/123?keyword=keyboard+with+touchpad+apple In PDF document text
    • https://wumunelopilum.weebly.com/uploads/1/3/4/3/134395902/6028919.pdfIn PDF document text
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/b9c9b7b158.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/tuwobidudaxot_kuvoxa_livosejatat_rafedegoruf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2090/9207/files/tegog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/gilurosiwopavivepagujojog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/coldest_place_in_the_world_right_now.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3659/3304/files/ice_cream_birthday_parties.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d46b496-38d3-4fab-bdd7-7335b5d93164/90214324694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb700b7-4c0e-46c5-b160-e3f00ee243fc/70503168855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a5b7120-61b8-439b-96a0-7813e4df114e/zazikeboxezodinajexixig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d7121e-4c23-42d8-ae97-50fa63ab8da4/jejilukibolorewevake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b481bc4-0839-4c51-a65b-9026721d2ad1/litisivi.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/cosmos_book_by_nagendra_vijay.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/30265951062.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/tratamiento_del_asma_bronquial_en_adultos.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/sanjay_agarwal_costing_book_ca_final.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/solex_carburetor_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/calculus_1_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/aari_embroidery_designs_books.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/assessment_rubrics_for_teachers.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/catalogo_inglesina_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd5bbf1e-2f81-48ff-ae51-56eb07eabbb6/53705758303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a8a8845-64b8-42e8-8864-daccfca0cd6c/1913683572.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_off00006e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3D 5288 bytes
SHA-256: 3a608a358bd36bea72a8e4fd89fafbb16ad3d1717a23598a3dd813fb77a392ba
font_01_sfnt_off00008044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8044 10932 bytes
SHA-256: 0ec05d2c9369e1c88240d0b741e3f197db1544f59b3ae7e4fca55383a94a11bd

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