Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8848c7b3fead896…

MALICIOUS

PDF

44.8 KB Created: 2020-11-01 05:30:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e77951548d3af732ba28f9feb8b75e11 SHA-1: e1d65bed0debe2a6b0ae6522ff732a6289daa269 SHA-256: f8848c7b3fead896eac9cbd224602585a3b0ccb68280bd3247026cb7ce480ed9
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it links to known malicious redirector infrastructure, specifically disguised as a free download lure. The embedded URL `https://ttraff.club/123?keyword=hebrew+stories+for+beginners+pdf` is the primary indicator of this malicious redirection. The ML classifier also strongly flagged this PDF as malicious.

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.
  • 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.club/123?keyword=hebrew+stories+for+beginners+pdf In PDF document text
    • https://limisakaxenit.weebly.com/uploads/1/3/4/3/134371081/famogasatixozo_wedalafogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_5f988f370ad19.pdfIn PDF document text
    • https://fisalusul.weebly.com/uploads/1/3/4/3/134341538/7cd80a.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/1/0435/5194/8963/files/44979471834.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3315/0118/files/weed_eater_fb25_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/967dfddf-c594-4c64-aecd-a18cfe4a523e/aplicaciones_de_la_funcion_cuadratica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/8656/5542/files/9287849372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25f2c815-459b-4684-95dd-732e13a4b476/pitavunuleli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c90f2ea1-0c85-42b4-a48f-12f10453558a/king_kong_skull_island_movie_download_in_hindi_720p.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/7046/3646/files/full_house_south_korean_tv_series_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/13_fatal_errors_managers_make.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA4 2980 bytes
SHA-256: 57619121d7526352a2171be5dbcd3df979f18361d01fb3ea0ddab245013d936f
font_01_sfnt_off00006945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6945 5160 bytes
SHA-256: ac158f936cd6144481f8e6515bcbfcdbac4fc270a97521a9752dc50646499c86
font_02_sfnt_off00007aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AEF 12920 bytes
SHA-256: 83c47eab1a33a65d5ecf6cf0832a3c7564f7d2e87fabae894e058d431a0aa833

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