Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a21fb4faf31fcf…

MALICIOUS

PDF

46.0 KB Created: 2020-11-01 00:18:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 3da452ed13b4b7d7397588e4fa14b9a8 SHA-1: 8e8c287200dba984e76002a1fac9075b80784966 SHA-256: 12a21fb4faf31fcfbca58c26365257d9282c8c1eedc26d702e2300ed239301f4
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/wb?keyword=desigualdad%20en%20mexico%202018%20pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427295/normal_5f9bf54198350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_5f90d81b94e41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_5f8faa8fa84d7.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/1/0427/6381/3020/files/17479031744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28912bb7-83ad-4d12-bc16-7c0cea8d3c78/vpn_for_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/92981194960.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8682/2554/files/89249274627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d15546-4528-4d28-bd06-32110461e457/37890133559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e61d631e-c9ad-4f5e-bdef-42366857ff2f/65625402418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bfecf24-88b4-4244-a9ac-92078491a354/6071122041.pdfIn PDF document text
    • https://s3.amazonaws.com/lanowilovuviwib/desert_oasis_lab_rescue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1337ca8-85b0-4518-996c-fe498cc25a2a/sagoporapatijokalikefajaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/comfort_zone_ceramic_heater_cz446wm.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8446/2274/files/rav4_roof_rack_basket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a326cbe4-9c66-4f14-b45d-4aa3bdd42502/beveteri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b89c07d-ae33-4d49-85c2-c98d6621b031/vizeresodukixowalipobop.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_off00006eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAF 5968 bytes
SHA-256: fce3972470fd0e514e4738c39cd31d6c393c27f1c65c2ade04fa41ea692f610d
font_01_sfnt_off00008307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8307 11760 bytes
SHA-256: 163c0468e3ebd7b2a4b9ddc54f2dde2c00e0bce39a82b0b92070dcd2af20d076

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