Malicious PDF — malware analysis report

Static analysis result for SHA-256 55665ac9a7a0c9f1…

MALICIOUS

PDF

43.1 KB Created: 2020-08-21 22:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d564650c4cd1645dc1d3dd4151f7bc84 SHA-1: 6a511c987d420b23d315b5cfcb39048e748df5af SHA-256: 55665ac9a7a0c9f1c27abc87bf5dca8305aa63e70cd81abff13849592207aeec
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a lure for "Byju app apk" and embeds a large number of external links, many of which point to a redirector. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=byju+app++apk`. Another heuristic identifies this as an advance-fee scam lure, suggesting the intent is to trick users into clicking malicious links under the guise of a prize or delivery. No scripts were extracted from this sample.

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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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=byju+app++apk In PDF document text
    • http://weluji.michaljphotography.com/uploads/1/3/0/7/130775173/4070900.pdfIn PDF document text
    • http://kotija.acct301.ehabacademy.com/uploads/1/3/0/8/130813714/bupolo.pdfIn PDF document text
    • http://files.globalreg.info/uploads/1/3/0/8/130874110/1a5b226958dc.pdfIn PDF document text
    • http://files.cloverdalepreschool.com/uploads/1/3/1/8/131857580/345f1d.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/1/0434/6734/1981/files/fusionner_2_documents_en_un_seul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1186/4738/files/55522670142.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2190/0696/files/tecnicas_de_busqueda_de_informacion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/2680/0791/files/getuvezevajoposutujut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1705/2066/files/rijijanomaminogomizuravat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1594/3845/files/characteristics_of_enterobacteriaceae.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9164/7894/files/27390780880.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0743/3125/files/talutefupaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/tapisivugoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9390/0958/files/46686767726.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_off00006bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEA 4796 bytes
SHA-256: 299857f837d56f9af8208ef81457e04d85bb9feaad2d20f4d4dff60ffd5d5b92
font_01_sfnt_off00007c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C67 10496 bytes
SHA-256: c062c3ef727857a19413934f5b11a42d47392dec710b82fb0a6d6e2d7ea1c736

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