Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a4faea6efbd121…

MALICIOUS

PDF

40.7 KB Created: 2020-08-15 01:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4297d147030882a95cc180553a39f617 SHA-1: ca52e7da65a166abbcfa72c0198b07f61a790bd6 SHA-256: 66a4faea6efbd121e3a9968d6520905df7fbafc387f761894686226eaf9366e0
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to a redirector URL that is flagged as malicious. The document body, though heavily obfuscated, contains the malicious URL and references to free downloads, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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.ru/pify?keyword=wish+grammar+worksheet In PDF document text
    • http://files.wordupinc.org/uploads/1/3/0/8/130815095/3425878.pdfIn PDF document text
    • http://files.leandremeldener.com/uploads/1/3/0/9/130969190/3481642.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/1/0441/2129/2952/files/chrome_version_44_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/49096747698.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/wunebofu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6911/1461/files/all_of_me_lyrics_and_piano_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7827/7525/files/saxon_math_intermediate_5_solutions_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0877/0726/files/9509647338.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9181/2771/files/tuvafapinonitinifadirow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/convert_to_word_big_file_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9315/5237/files/99178643291.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 7

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_off000061c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C6 5236 bytes
SHA-256: 7933620ebafa4f3e30c80deb331e342c32822f69fb9369110a588b2a1f50e5fd
font_01_sfnt_off0000738c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x738C 10176 bytes
SHA-256: 9701611805a4e1ba21054cfb3a5108fcab46e331d32db45ed4ba693121f4a7fa

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