Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bfa0e3fa9fae6c…

MALICIOUS

PDF

42.4 KB Created: 2020-08-25 21:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9de558df85cbcd24c74630dcf5a9b95e SHA-1: 5f8d54be5eea608913bcce6749c686e1aa9fd0d5 SHA-256: 18bfa0e3fa9fae6cebce487a5d394664bd5f434e032bb8fe1c08b26e12ba609d
194 Risk Score

Malware Insights

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

This PDF document contains numerous links, many of which point to a redirector service known for distributing malware. The document body, though heavily obfuscated, contains text suggesting a software download lure, specifically for 'Rack2-filer v5.0 full version for pc'. The presence of a malicious redirector URL and the nature of the content strongly indicate a phishing attempt to trick users into downloading unwanted or malicious software.

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.
  • 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.cc/pify?keyword=rack2-filer+v5.0+full+version+for+pc In PDF document text
    • http://files.hoopspulse.com/uploads/1/3/1/3/131378950/1003228.pdfIn PDF document text
    • http://files.detroitvga.com/uploads/1/3/1/4/131409309/nebenaj-wupefudutijak-mosaxerijivakis.pdfIn PDF document text
    • http://files.smarterbites.org/uploads/1/3/2/7/132712214/xuvorop_resopofogopam.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/1/0431/9005/9176/files/92559281012.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/python_remove_n.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/4103/3114/files/chicken_invaders_5_full_version_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9570/3204/files/matplot_lib_create_animated_frame_with_widgets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/peworawek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1568204463.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6229/5714/files/ammocoete_larva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/datefotaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0360/8216/files/dobetowenikakudafudok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/77146313655.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8001/5271/files/gubbi_mele_brahmastra_kannada_movie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7328/9888/files/84146184163.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_off00006616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6616 5604 bytes
SHA-256: 9ad34c142cbe2098e7689928867d53dc3a952d914e4f7f965cf27ce6ad980b92
font_01_sfnt_off00007942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7942 10440 bytes
SHA-256: ff0389f3ec01d6917df8e4857e7927a167686361451853fe42afe27c28146239

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