Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8c2ff478b079e7…

MALICIOUS

PDF

41.2 KB Created: 2020-10-31 06:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 283d9ae9a6c356dde5926141ccf55c75 SHA-1: 980e944beb95dabbeda95720b354b145c0572aa9 SHA-256: ce8c2ff478b079e7cac58195d5ac13c6f872e033c03c93966b50c38756858044
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, including known malicious redirectors and a link farm, indicating a likely attempt to drive traffic to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, and heuristics confirm it acts as a redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to potentially harmful content.

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/aws?keyword=emotions+flashcards+printable+pdf In PDF document text
    • https://jaregufadux.weebly.com/uploads/1/3/4/0/134016720/fekij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371514/normal_5f9343d9bc316.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/voxeduzuruvimo_nofavavazuf_nuvidivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f9c2d6292059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386349/normal_5f8d85c980b74.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/571b5c01-a8a1-4a50-92e2-4cab15be43ff/29153138468.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/lego_marvel_superheroes_2_trophy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5899fd64-dd07-4536-9a9a-f5649ea7856e/libro_paulo_coelho.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/saxasutu.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/sociologa_que_es.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e8d3fd0-c262-4850-a3f5-1d51340131f0/zalemafaruti.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/political_strategy_and_tactics_a_practical_guide.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_off000062e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E0 5492 bytes
SHA-256: 2fe3df66ab369c6c15b8dc5f41cca210a8f42f8e84187dc6adfc0bccb7827870
font_01_sfnt_off0000755d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x755D 10252 bytes
SHA-256: 8e99556a174365558e6908badf245a90c3676f8884a01528b5890ab475f16cad