Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f8c68757e1c7e4…

MALICIOUS

PDF

47.3 KB Created: 2020-10-25 21:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 8a7a4d033334892605eded4088c54f75 SHA-1: f69caca5c6b3c061821bd4fbcb752de6cf3dcabb SHA-256: a8f8c68757e1c7e4b3a08643a8ae0d8e8f78ab271900dc7f52aa71909addd482
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/aws?keyword=bersin+by+deloitte+2018+pdf In PDF document text
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/nexuwewapad.pdfIn PDF document text
    • https://tukibasitotaz.weebly.com/uploads/1/3/4/4/134445351/nuzegolik-dupipagumojiji.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/vunud.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/975233d5-1f59-4270-bcac-539dbdfab8ce/pubg_logitech_rapid_fire_macro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95db2bec-e0f0-49cf-b4cb-8a5cdfd4d34b/nepanowasatasidasiwudex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5811f821-bc8a-4d36-bc15-da8f62fb09ca/192840253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc758a91-ed96-4749-b3e6-d8cc5567c1e9/hyundai_xg350_repair_manual_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f715cf3-d1bf-4d8a-a32f-31b5a8c4c70e/49200071640.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/gudamipuvuvifefikilixara.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/prontuario_del_cemento_armato.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/cell_organelle_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/sinamivaxeveje.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/82799179647.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2007/3150/files/bodiporoxezadug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/3368/7750/files/waxusupukovewuvomom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9462/9788/files/xagelasuzonofudixifadifo.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/gatonizifugiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/20456710848.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/mivetilifusogibonajolo.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_off00007611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7611 5636 bytes
SHA-256: eb3d31e50442836cbf5d1e0175aec96cc313067335cfd17f774dba5e20f0c12c
font_01_sfnt_off0000895d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x895D 11524 bytes
SHA-256: bb92c311597c1020ccb6e9efd980f95e880fda0135d9fe548388aeab0d58db3e

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