Malicious PDF — malware analysis report

Static analysis result for SHA-256 287ad0774cbbfdde…

MALICIOUS

PDF

45.0 KB Created: 2020-07-30 23:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f9f8d71d2034707a0437a6c2c0a8158b SHA-1: aa90018eb4d81c8b5c5490b79ff84bc0eb5095ae SHA-256: 287ad0774cbbfdde4d62f492e535b385043b75120e2f1911fb13a89df435f831
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a 'Couchbase tutorial for beginners pdf'. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=couchbase+tutorial+for+beginners+pdf In PDF document text
    • http://files.genehamiltonartist.com/uploads/1/3/1/8/131871704/7686114.pdfIn PDF document text
    • http://files.strozzimeowvellous.com/uploads/1/3/1/3/131398140/9294474.pdfIn PDF document text
    • http://files.noarderljocht.com/uploads/1/3/1/4/131437984/reluwidiwarom.pdfIn PDF document text
    • http://files.nikkosbread.com/uploads/1/3/0/7/130775649/magatuj_ribuwuvojiwim.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/1/0433/0687/7080/files/wopesutokuvikoku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3461/4688/files/sojexapeva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8990/3259/files/mibeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/tuviburor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/14135917334.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5906/1670/files/jobasubimo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7707/4086/files/vaxudu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/1537539660.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3762/9348/files/61285430098.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/fuwuledumusanagesik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1765/6728/files/pogode.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_off0000720b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x720B 5464 bytes
SHA-256: 7bab0b7e80a9b0a97369f96c5bc9da15905ce72b1412ece8413f4810782114ee
font_01_sfnt_off0000848b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x848B 9968 bytes
SHA-256: 85a149473e7f181e3b7bc11fdc77d6a0fec96aef53175c32e18cad6cbbdf13b3

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