Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09d45fa7636b661…

MALICIOUS

PDF

43.8 KB Created: 2020-10-28 12:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3bba5ff2f961acb5e2d031cfa37d70b7 SHA-1: 8e8f38be3016f565ffc7bbedcda0ab12cf7a5751 SHA-256: b09d45fa7636b661b49013d21631906f8178f4c6b614dcf9eb7d775843baa8e3
202 Risk Score

Malware Insights

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

This PDF file contains multiple heuristics indicating malicious intent, including links to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm for SEO phishing. The document body, though obfuscated, contains a URL that is also flagged by heuristics. The primary attack pattern involves luring the user to click a link that redirects to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/123?keyword=gazillion+bubble+machine+not+working In PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/7599049.pdfIn PDF document text
    • https://gerexogevi.weebly.com/uploads/1/3/4/4/134463414/8013326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389801/normal_5f92f545872c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5f8e8725030ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_5f8898896d102.pdfIn PDF document text
    • https://gafekiwukuwemul.weebly.com/uploads/1/3/4/3/134313713/5793951.pdfIn PDF document text
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/3781453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401711/normal_5f98ea4249624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_5f9816c3006da.pdfIn PDF document text
    • https://letalisukom.weebly.com/uploads/1/3/4/3/134316231/lufinuvuxo.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/zuxadol/zotofikefemipajanozizu.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/muzafeserenise.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/compendio_del_catecismo_de_la_iglesia_catolica.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/94576653174.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/89563382434.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/40319087898.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/66812486536.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/68449543625.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/fegurojipomoxusabab.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/wordly_wise_book_5_lesson_11.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/download_carrie_a_estranha.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/paramount_math_book_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/52550764871.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/cover_letter_for_job_application_in_bangladesh.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/novoxafejivugezatov.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_off00006766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6766 5412 bytes
SHA-256: 056832c0a04856e3707f8bb05e5f72ba1720416657f4e43971694054b67b05f3
font_01_sfnt_off000079c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C2 11888 bytes
SHA-256: 7a01c5f8c0becfa67d8f23aa0aa70dc1da421d62830f6bb3ed119484f528f5aa