Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a5abc4e2c8f54a…

MALICIOUS

PDF

54.1 KB Created: 2020-08-05 09:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c10709872bde2f893f350525dd209dcb SHA-1: 20a9b3e53690011da3e1890edab74413c352a3f8 SHA-256: 87a5abc4e2c8f54a1e1eab20235e875ce83b99feb073f813a658cd69ec2b6231
194 Risk Score

Malware Insights

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

The PDF contains numerous links to a redirector service, disguised as educational content, which is a common lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this. The document body, though heavily obfuscated, contains the redirector URL and references to 'math worksheets', reinforcing the phishing pretext.

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=math+worksheets+5th+grade+pdf In PDF document text
    • http://files.themoseschronicles.com/uploads/1/3/2/6/132682040/297927.pdfIn PDF document text
    • http://dodivivi.mermaid-consultants.com/uploads/1/3/1/4/131437987/6538094.pdfIn PDF document text
    • http://files.brittanywoolsey.com/uploads/1/3/1/3/131383943/sidaxanitawijid_juwakobe_vezevodedeje_turebuzasedo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69865881622.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16711599054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/sivudatuvobiganu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3133/0969/files/sofulatuken.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6549/1107/files/22636740290.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5698/0377/files/tanilugadadaxuvoluxozufel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/lavasad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/filifelita.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/audible_app_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0875/3827/files/23483243187.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8736/2216/files/fesefuzomimofe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6297/6921/files/88307262990.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 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000894a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x894A 5188 bytes
SHA-256: dd0d9db05961b1197fa8633d884ddee1429720c5a12a384900f283ade18b33e9
font_01_sfnt_off00009b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B1E 9976 bytes
SHA-256: 4761bf6937aec1901415004d9a4c047f8b68c56ffe7d538737d9b8581f0becaa
font_02_sfnt_off0000bd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD27 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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