Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f1df97bbe08198…

MALICIOUS

PDF

43.7 KB Created: 2020-10-17 04:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: f5978d72238b04b924a0e5f55d0cc540 SHA-1: dbd58ef7a6ebc350a4df50405f50bfe31cfebaeb SHA-256: f1f1df97bbe081988fb0194b09b244242735b3367d6c683a1bace3d2563ca4e3
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://ggtraff.ru/123?keyword=mark+twain+innocents+abroad+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_5f89bf1838b16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f87a0c67efc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_5f8a0ae2438b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f87508341def.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/zaxijolo.pdfIn PDF document text
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/3a9d05.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/cd3619fef1.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/1a75f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f88ae4b0960f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5f8a3eeef3aeb.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/d0c0c7ee-34b1-45ed-bead-0a5d8bff94d1/kazedovuzoferovabufama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e1f6aae-1f01-4882-8e3e-1f620f0ddf0f/4050809972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a9540b-4a2f-4082-9b8e-20469b98fd9b/nodijelivesebebimopaneg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f264563-9190-43cb-988d-1aae581b632a/73077660191.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8234/5376/files/nigufodow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/0236/4579/files/60476927274.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1070/6619/files/gobesiludebolipawemaruwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7669/7246/files/vedifosigavikagugawen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1225/7952/files/vojokalajagijifu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6952/9509/files/fuxudanejileda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8889/6415/files/cbt_manual_for_depression.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8956/3299/files/sodomy_in_the_bible.pdfIn PDF document text
    • http://photofiltre.free.frIn 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_off00006cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBA 5420 bytes
SHA-256: 76816ec8655bcf4d9ece95c25d50c2e3f05774faf7776fabbb0759d0e90c3029
font_01_sfnt_off00007f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F47 10076 bytes
SHA-256: 37ca0484d345c511e12c3a9c48f0959ed6fa9ba0be9eb554402e205cc6bddae5