Malicious PDF — malware analysis report

Static analysis result for SHA-256 8354a9f9071f3321…

MALICIOUS

PDF

42.8 KB Created: 2020-10-05 16:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a755c20f15c8e4a0580df2b7eae3f7e4 SHA-1: 22de8c4471b1300d9cf4bb288ccc182f071ff80c SHA-256: 8354a9f9071f3321a0f487bacd5d840eee8afbe4667c1fb8369b1a47b70f46b8
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.club/pify?keyword=cost+performance+index+example In PDF document text
    • http://files.bafustago.com/uploads/1/3/2/3/132303035/nesewazapol.pdfIn PDF document text
    • http://files.polos.org/uploads/1/3/1/3/131380343/6402488.pdfIn PDF document text
    • http://dusafis.daniellekelleytolbird.com/uploads/1/3/1/4/131438096/rujewazazefu-xogelijivupe-lapabegik.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/43ffe4c4-2b66-4a24-af5d-44318031f654/nobopunutebena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aacbe582-e422-4e7c-bc6b-2a5814ddb8e0/32965949606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195fbd56-f15b-430e-8788-ff96dbe9e171/fomejirapebodesofi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2835/7020/files/jokapaxepikuxibiwanefosuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9437/9163/files/48629030685.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9394/0641/files/wwe_13_apk_obb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5232/6823/files/warframe_ayatan_treasure_hunt_not_working.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3856/3230/files/glacier_pool_cooler_parts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5161/3351/files/harry_potter_slytherin_memes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8304/1430/files/89458914982.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/2765/2759/files/comptia_a_certification_all-in-one_exam_guide_tenth_edition_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2623/0679/files/molokokigugesiredegot.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_off00006a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0D 5272 bytes
SHA-256: a59f2aa5feeaf58e8de2db6f395cbfc5fac4a7c6bd8de725b9c4e7d990e0f5ef
font_01_sfnt_off00007be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE1 10176 bytes
SHA-256: 57a22829da4f94402361ab083310fff14cba81131d6b823ad3157413744c96c8

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