Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18d1aeb62c8cc16…

MALICIOUS

PDF

43.7 KB Created: 2020-09-10 10:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a398a3c71613e2c035af9ac5a62c469e SHA-1: 2e7ec28550a167ae2b6e2ca8da8be6266bb76d0f SHA-256: f18d1aeb62c8cc163e1493480c65da5cd343a187c422f91b4c85e9fd3c10d6b5
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains and are flagged as malicious redirectors. The document body, though heavily obfuscated, contains text related to 'English comprehension worksheets year 4' and includes the primary malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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.club/wix?keyword=english+comprehension+worksheets+year+4 In PDF document text
    • http://jezidekix.stmaryschurchbrighton.org.uk/uploads/1/3/1/4/131438641/wezaw.pdfIn PDF document text
    • http://files.abfnspiritofhealing.com/uploads/1/3/0/8/130874485/mafamit_nokoj_womodejisufoxaw.pdfIn PDF document text
    • http://setijak.theiceridge.com/uploads/1/3/1/0/131070867/a370fd80ea055d.pdfIn PDF document text
    • http://files.hopespringsvenue.com/uploads/1/3/0/8/130813132/8bcd0cca92d1.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/1/0434/5973/9814/files/report_traffic_accident_to_police_qld.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3911/3895/files/48583156294.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0963/8553/files/a_cradle_in_bethlehem_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/belukarufunus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2949/4936/files/70034683125.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d5cf39_5ed2ce6825cc47cf888cc8ad8debf052.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/238140_5abe625a08c2407baf15f827b172115d.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5344/0414/files/growth_of_islamic_banking_in_pakistan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4939/4071/files/22445692069.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0012/6880/files/anandam_video_songs_mp4.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 5

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_off00006b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B02 5648 bytes
SHA-256: 16e43dac52d5259e7a7f67d47d65bad50abde0bda84a7603b92acf8a38a8c676
font_01_sfnt_off00007e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E38 10864 bytes
SHA-256: c1152193c43807eac65dc9804ebb4d71a03e8962b0d4778ae2afeac0a474d7c6

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