Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8ca7d45915c276…

MALICIOUS

PDF

42.9 KB Created: 2020-08-06 16:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b2726d8dbbe413c0f292646557b14133 SHA-1: ee972483f4b96ad3626b276a388c76e850dd7ad8 SHA-256: 4f8ca7d45915c276848baa41f024eb94e06e76de50c2cabdaeb98ea2360a4a6c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm designed to SEO poison, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, indicating the primary intent is to lure the user to this external site. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=adopcion+en+parejas+homosexuales+a+favor+pdf In PDF document text
    • http://files.okpoets.org/uploads/1/3/1/4/131406075/2562274.pdfIn PDF document text
    • http://files.mariettagutterclean.com/uploads/1/3/1/1/131164281/tevep.pdfIn PDF document text
    • http://files.mainstreethousing.org/uploads/1/3/0/7/130775363/62308e0a2ec48b.pdfIn PDF document text
    • http://files.moderninternationalinc.com/uploads/1/3/0/8/130874510/4833088.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/1/0432/7332/2664/files/detroit_diesel_8v92.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6498/1664/files/teaching_interview_questions_and_answers_tell_me_about_yourself.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1347/9320/files/83385393381.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/block_quotes_color_discord.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6532/7262/files/zuradofof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9436/7644/files/81206520404.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3470/6069/files/vekiwejezenogo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/tuxofupisedilifovazoxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0647/3886/files/watch_dragon_ball_super_online_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7580/6119/files/american_english_file_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9741/5077/files/wevefigubomojanad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23582012054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/rovibuju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0269/9681/files/92978975863.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/99373296198.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_off00006585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6585 5588 bytes
SHA-256: d5b99ef476241eb3256301d85b25e5379c9d10be2656f0d6fdce5389ee6a75ab
font_01_sfnt_off0000786a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x786A 11040 bytes
SHA-256: 7c5be2c5d1d72172e6e6c69c7f6c684de07e45e804f498cb0c97000ffb66af45