Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfc1bc428461c02…

MALICIOUS

PDF

45.7 KB Created: 2020-11-02 06:11:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 4542f47e0a75d05a006472605312d097 SHA-1: f8b9880b163051a3284075722340b4ca051a4ce3 SHA-256: 4dfc1bc428461c026814d51d94be1c16bdcaac9a88cf0efae899da63c56d5f77
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.cc/123?keyword=c459+pre+assessment+wgu In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f8747f76b015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5f8e416b56075.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/1/0503/7244/4328/files/candy_crush_android_game_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/vedixojowije.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/zatorixijuveka.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/sobagekobebuwuti.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/73472035099.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/sql_injection_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/87072583686.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/agriculture_information_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c3a12d-4ad8-43c9-a120-f52bfb3ac7bf/nazaludenutano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/8066/0161/files/20930335066.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/holotropic_breathing_technique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c78d8de1-5a92-4be2-9e63-408928418156/nibujinenuwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0210/1411/files/talotulus.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/38577256578.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_off000069e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69E0 5472 bytes
SHA-256: f7cd9f9e7169c9d374b940b91e2706138eb3b6bbaf4d8a9b46e571f75132729e
font_01_sfnt_off00007c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C76 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00008504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8504 11008 bytes
SHA-256: 3b80675e1d477f81c0cb2d8c7b8cd3e4f6cd6b08c288d4542ad8458a2449e402

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