Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b87f7fe2f7a3479…

MALICIOUS

PDF

44.8 KB Created: 2020-10-25 07:32:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 8eec5b4849dde3412a1564462e074ee2 SHA-1: 72639823c9163ad97d1bf62640bc14f0c05318d9 SHA-256: 7b87f7fe2f7a347956e629fafafb1ece22d0f48e87c4551b962cdb0877a2a4d2
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/123?keyword=flc+commando+game+apk In PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/bibesekukemugedovofa.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/656ae8963b3139.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/1d1f8ecc085ca.pdfIn PDF document text
    • https://fopudodesesiwen.weebly.com/uploads/1/3/4/3/134344932/lusib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/cursive_handwriting_practice_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/anna_karenina_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/jiwevokinonulibo.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/winnie_the_pooh_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/string_theory_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f47b6a8-2718-4932-accb-b5c78db97180/62346626696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df34dac-0d49-457e-b4a1-5a510721278b/asus_cerberus_keyboard_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2485ef60-a706-40da-abc4-d0b66d446017/91133764622.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/diccionario_biblico_evangelico_reina_valera_1960.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/baguka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6875/8429/files/tenor_sax_standard_of_excellence.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/7208/5926/files/77388678971.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8198/0832/files/42439884236.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59FC 5140 bytes
SHA-256: a7667cce6f65f15d222f30f1a60ce97d4e41488cadcaf534d065070a9fbfaeea
font_01_sfnt_off00006b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6A 11164 bytes
SHA-256: 8d08583d6e7516404487a0c5309077673d1edbc77a6d3e2298227818988f12b8
font_02_sfnt_off00009189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9189 16068 bytes
SHA-256: 5338b60dac2ddcc9fbf81734882903060897ff8c18563aad6864a581beec55c6

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