Malicious PDF — malware analysis report

Static analysis result for SHA-256 9440de6d81f516ca…

MALICIOUS

PDF

46.1 KB Created: 2020-08-11 03:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5cee87b0eee31e8ea0669a0b46076398 SHA-1: d359c48611b11b168e18dd79ffdb092c300be40e SHA-256: 9440de6d81f516ca37567410660f486cc9387ef73094caaf341c81fe77eb85ca
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains embedded links that lead to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure for '5th grade math word problems worksheet pdf'. The primary malicious IOC is the redirector URL, which is likely used to serve further malicious content or phishing pages.

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=5th+grade+math+word+problems+worksheet+pdf In PDF document text
    • http://files.foundationoftruth.net/uploads/1/3/2/7/132712235/sogubidog.pdfIn PDF document text
    • http://files.marencoartrestoration.com/uploads/1/3/1/8/131871894/5632b4cd.pdfIn PDF document text
    • http://files.soundviewhomeinspections.com/uploads/1/3/1/4/131452823/7302261.pdfIn PDF document text
    • http://files.teamcenterinc.com/uploads/1/3/1/8/131856991/wewawufilidutowagax.pdfIn PDF document text
    • http://files.eastlakepta.org/uploads/1/3/2/3/132302963/423789.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/1/0431/7003/7917/files/bojedosejufozuwus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/6117/8521/files/cooking_fever_cheats.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9885/6867/files/xololizefe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1681/2706/files/xozadosizotapubeva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5559/6198/files/lowipovuzivolopeta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/4097/7574/files/ancient_fruit_wine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/besos_de_chocolate_mara_young.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/71080302694.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/zofuvusojunirasevoged.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6366/5062/files/electronics_and_communication_engineering_thesis.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_off000075a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75A9 5780 bytes
SHA-256: 3bf7470baf0c433c118ffdb0e1d65a057d02924e4ebed1d31bf60315d184a742
font_01_sfnt_off00008943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8943 9876 bytes
SHA-256: aca64c568e49e982795528a5fac9c302994f14631b7c2c8a24cc70bb049d8ef3

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