Malicious PDF — malware analysis report

Static analysis result for SHA-256 891738e5445229cb…

MALICIOUS

PDF

59.9 KB Created: 2020-10-12 19:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: b297d85eb5ea990ddb922e870d59a91d SHA-1: 567af52a26f07f2d402439c3b3e1ad362a763b67 SHA-256: 891738e5445229cb27b77a7eee0a72fb6dafdfd001defa080ebbc00bedb38f1c
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external resources, many of which are part of a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://cctraff.ru/strik?keyword=kuk+sool+hapkido+syllabus, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to disguise its malicious nature. The presence of a large number of PDF links and the ML classifier's high confidence score further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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.
  • 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/strik?keyword=kuk+sool+hapkido+syllabus In PDF document text
    • http://guboj.shirleywatsonfinancial.com/uploads/1/3/0/7/130776330/506540.pdfIn PDF document text
    • http://files.gbsupplyco.com/uploads/1/3/2/3/132303269/fufawudenixozaluto.pdfIn PDF document text
    • http://files.kohenproperties.com/uploads/1/3/0/7/130776446/jefewurozi.pdfIn PDF document text
    • http://files.opticalequipmentcenter.com/uploads/1/3/2/6/132695323/rimabek-wozekogobogitix-xiwuniji.pdfIn PDF document text
    • http://tunimaf.shelbystangatreasures.com/uploads/1/3/1/6/131606490/vureroxewikasani.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/1/0268/8253/9698/files/51758230329.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/0748/0476/files/golden_comet_chicken.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4195/5221/files/66037782751.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1371/3315/files/opera_mobile_store_apkpure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4457/6666/files/educacion_para_padres.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5530/7159/files/dr_green_synthetic_urine_reviews_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0376/7713/files/5_love_languages_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6666/6407/files/august_ahrens_elementary_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce13e3f-7589-4343-a228-572cc5b4b566/nitugoxexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc1e345-9da6-4c74-bf3b-b90996e587f0/3393070202.pdfIn 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_off0000bf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF04 4804 bytes
SHA-256: 8074bdbc673e4ed9b9a523959d96006d09494a4d2316fb8f6b5d3987c30a24b0
font_01_sfnt_off0000cf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF55 10848 bytes
SHA-256: 2595153a5f26ad42bc6b35ea7279abc11e54383bd4d81d129093360958bf2497

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