Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cd1281ff5d523d…

MALICIOUS

PDF

40.7 KB Created: 2020-10-31 13:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 242d11baebaf1fa3c7f71a10b88f2376 SHA-1: db3652a66391581eb2fa956c09509f68277e6d4a SHA-256: 97cd1281ff5d523dc44bceee5b2990f918cb8c94bc790375b55449e026447f42
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cctraff.ru/123?keyword=oshkosh+public+library+summer+reading+program In PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/bomunosawukub.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/fonukimodoxebubokaka.pdfIn PDF document text
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/b43669f2c.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/xoxezal_vodapusej_pulobuvodibepo.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/1/0461/3170/8072/files/16831208586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e15e8f5e-224c-4239-9fc8-4e3a4f0cb077/92774672185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38dfc414-209d-4e38-b1ed-118af896c590/fokamopapepe.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/medical_microbiology_nagoba_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/mokifopifelipolixal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1689/1797/files/50879374153.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E50 5820 bytes
SHA-256: bfa76de3d2ed1b2f495da2076f3557b0d24d1885249b442c3d632981e536c821
font_01_sfnt_off000071f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71F8 10408 bytes
SHA-256: 8606f65450ddd94e82c61a37938b8f378ab06ac0c227da003dcf5bb1db023376

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