Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cff03c6683ef002…

MALICIOUS

PDF

40.7 KB Created: 2020-08-21 11:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 555ccb40bbfa6aca7824fe2ba29253eb SHA-1: d068e387b1618bae5ca47e4327b0ebc5aa7d2cb0 SHA-256: 5cff03c6683ef0025e32dec5a7d4f958a0a9367bbbb1fb5766f359a5a940dafb
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure for a 'Bluetooth keyboard app for android tablet', which is a common phishing pretext. 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.cc/pify?keyword=bluetooth+keyboard+app+for+android+tablet In PDF document text
    • http://puxigi.riverrivalwretling.org/uploads/1/3/1/3/131380485/tavaguxawana-lololemupupozot-luwodisudekuzug-tubifinol.pdfIn PDF document text
    • http://files.cozykidsembroidery.com/uploads/1/3/1/4/131409170/ninebafakafekip.pdfIn PDF document text
    • http://worad.sunnybrookranch.com/uploads/1/3/2/7/132712336/44d88f228f04b.pdfIn PDF document text
    • http://files.rusticdesignsflowerfarm.com/uploads/1/3/0/7/130775997/femojiwotefa.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/1/0437/9095/8749/files/semafopizu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1573/2381/files/appointment_letter_format_for_marketing_executive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/36269644949.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6483/3686/files/43543379465.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1733/1100/files/likovijijifisawunetemujam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/9155/9327/files/casio_illuminator_alarm_chrono_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9790/6589/files/hydraulic_accumulator_circuit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7218/4732/files/daxavuxululanonituro.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_off000061d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61D3 5308 bytes
SHA-256: dc34832a8117023fa6745bc801038df5e4b9d7a1b32559e458fb07e8b01e05a7
font_01_sfnt_off000073e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73E2 10040 bytes
SHA-256: 5bd6635631d18f7d41931a7db61e423c86580e842a94baf9ea5676fcb862599f

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