Malicious PDF — malware analysis report

Static analysis result for SHA-256 854a766c1087b96b…

MALICIOUS

PDF

42.2 KB Created: 2020-10-07 07:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: c0ae8d80e0e451be8fbee4125b878767 SHA-1: 98a6fab15602c4bf522a4cdfe792b3bba148e319 SHA-256: 854a766c1087b96b833502993122d977636aed7742ee96b98cf3e66f3296e98b
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=meth+vs+rice In PDF document text
    • https://site-1039892.mozfiles.com/files/1039892/mozawiwunumuvaguvabede.pdfIn PDF document text
    • https://site-1040131.mozfiles.com/files/1040131/ravilu.pdfIn PDF document text
    • https://site-1036785.mozfiles.com/files/1036785/75288227998.pdfIn PDF document text
    • http://files.kateweierphotography.com/uploads/1/3/2/6/132695438/mibuw.pdfIn PDF document text
    • http://files.jazminoniris.com/uploads/1/3/0/7/130775280/karur.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://cdn.shopify.com/s/files/1/0437/9030/3393/files/bibewitog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/4712/9766/files/color_subtraction_worksheet_physics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8481/0907/files/94439379369.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2619/6898/files/west_oak_high_school_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf036b28-447c-4dfe-bdef-a5e14d27c7c0/mozegikerijutarikedibep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/446a8b64-531e-496c-8bb9-4240c4279327/5380915974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b551fe-b099-441c-9f4a-f72b83ee00ea/zaxubivekax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/476ba643-5070-4707-b49f-ba377267c6da/95046087646.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_off00005e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E34 4280 bytes
SHA-256: f7a2196a0ca7271eecb407fcf7500e9e84f9fe21be84ee93ce6c8bcc8a0f62aa
font_01_sfnt_off00006cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD8 9744 bytes
SHA-256: 9bdd91c10c973eff5d75675acbc0be044d8d24c4aa996c2856c407e7e3866964
font_02_sfnt_off00008e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E37 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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