Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b78e2c08b570db…

MALICIOUS

PDF

42.2 KB Created: 2020-08-26 00:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 310b476fb0d7f8e264d5f1b8a0d59f4a SHA-1: ff1015ef483ee74c229912200eda1fe2180ec96b SHA-256: 51b78e2c08b570db2c208a013214a9cebb74c9ec1e5b6a68aa421b900b2c2f8f
194 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, with one identified as a known malicious redirector. The document body itself is heavily obfuscated but contains references to URLs that are likely part of a link farm designed to distribute malicious content. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is used for malicious redirection.

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.link/pify?keyword=persona+5+alice+build In PDF document text
    • http://files.califiltrations.com/uploads/1/3/1/4/131438443/1822011.pdfIn PDF document text
    • http://files.androsoutdooradventures.com/uploads/1/3/1/3/131398351/54bc90a.pdfIn PDF document text
    • http://xofote.amcirealestate.com/uploads/1/3/0/8/130874523/9d016b5df04.pdfIn PDF document text
    • http://tukisemi.sspeterandpauluoc.org/uploads/1/3/1/3/131398097/duwoxedikija.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/1/0465/4917/2382/files/difficult_brain_teasers_riddles_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5287/4390/files/current_affairs_april_2020_adda_247.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8826/2821/files/nafuwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2837/2904/files/bluestacks_for_laptop_filehippo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/nudagojodipevoxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/27818984142.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/pdf_akuntansi_perusahaan_dagang.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/82810051745.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/9663/2472/files/consumer_reports_tv_brands.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2143/4005/files/zikuvebeledojatikab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8676/4446/files/71537754136.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3105/0915/files/tritton_usb_vga_drivers.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 3

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_off00006722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6722 5200 bytes
SHA-256: c260861e39e8ab5fc4fb2ccfbaba1104ede53d8b4899bf74ac0142c241219746
font_01_sfnt_off000078d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78D3 10360 bytes
SHA-256: b90dba29fd1232a6a48557ea6ffd125260788294a13e9635c12d6de45f4f4fdd

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