Malicious PDF — malware analysis report

Static analysis result for SHA-256 365fc870181bd88b…

MALICIOUS

PDF

37.8 KB Created: 2020-10-30 04:59:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: a3549ac40983f14f71d6fb860a51db1b SHA-1: 54279032661c7eda0a698d94a3cdf89b8957bd68 SHA-256: 365fc870181bd88b71e655c5320b83c53fd077faba4c4af14cf7db5a32893def
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.me/pify?keyword=facing+a+task+unfinished+sheet+music+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_5f89791dcc04f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371266/normal_5f89b23831177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413375/normal_5f9548a2bae4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376850/normal_5f8e8b964a368.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/tokexase-karuti-perife-junil.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/1b7f902.pdfIn PDF document text
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/5666024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416510/normal_5f958f620f56b.pdfIn PDF document text
    • https://kapekutom.weebly.com/uploads/1/3/4/4/134437999/kinodakilinemepa.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/memul/cerebrospinal_fluid_circulation.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/vixonusir.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/96521246183.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/small_combine.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/tafsir_al_quran_arabic.pdfIn PDF document text
    • https://s3.amazonaws.com/rekibedafowow/highschool_of_the_dead_episode_6_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/ruvufasufiwimasisasagi.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/pilezikuj.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_off000053eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53EB 5460 bytes
SHA-256: 847bab4487044c355a13662b6f3950fd9f793ef9d99a1f6740829b73188c6ce9
font_01_sfnt_off00006665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6665 10588 bytes
SHA-256: 833a24e3be561e7065935acc96b8159f432bf04b6140df5d4e84b202d1c909b1