Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20ef684aa82f040…

MALICIOUS

PDF

42.1 KB Created: 2020-11-05 01:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dfe55dcf6b470e7d26ad31de98bead04 SHA-1: 4b63bd5fbc345dcbf804cfe03844d24ae6601477 SHA-256: a20ef684aa82f040ceee100ab3344b5bab0ddcdcd5205356ba1b6595a5bd5fe9
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/123?keyword=abolitionist+study+guide'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, some of which are hosted on S3 buckets and Weebly. The ML classifier also strongly flagged this PDF as malicious. These elements suggest the document is designed to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=abolitionist+study+guide In PDF document text
    • https://gatofofuxiwiv.weebly.com/uploads/1/3/4/2/134265530/piropudar_javakepepimoma_kapiwofovig.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/a37e269a2.pdfIn PDF document text
    • https://dikosunasalimob.weebly.com/uploads/1/3/4/3/134363034/e7761.pdfIn PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/puvododenomet-zugur.pdfIn PDF document text
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/5078064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_5f9912e4e5cc8.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/laradusa/activated_carbon.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/important_accounting_terms_for_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/discovering_gis_and_arcgis.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/bulezexar.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/power_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mewezekilafef/ripiw.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/crecimiento_microbiano_fases.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/abc_its_easy_as_123_handshake.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/80761234960.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_off000066cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66CC 4920 bytes
SHA-256: 412b33a538dfb7b9ec1476d1788b8777f9a17f69960a1e59c01a427410938261
font_01_sfnt_off000077a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77A2 10540 bytes
SHA-256: 5f7cf03bca8c572736f39f97f8f55ea101784d12450710d3c8bdbfbd3109b831

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