Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4d221a2bee24cf…

MALICIOUS

PDF

40.8 KB Created: 2020-08-10 04:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 82ac30c445f27e40e06d977bb1d699ec SHA-1: 6e62ee2f2ffe6fda8e3732a00d4c16569602999a SHA-256: 8a4d221a2bee24cfde039a301ee613f20ef0ac5967ce52c54bc80f8a011d62ca
194 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, many of which point to a redirector service. The document body suggests a lure related to educational worksheets, likely to trick users into clicking the malicious links. The primary malicious URL identified is https://ttraff.com/pify?keyword=punctuation+marks+worksheets+for+grade+3+pdf, which is linked to known malicious infrastructure.

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=punctuation+marks+worksheets+for+grade+3+pdf In PDF document text
    • http://files.hkcofc.com/uploads/1/3/2/6/132683111/lobojevaresale_jojolurirukekof_nunaduwarutare_rulilik.pdfIn PDF document text
    • http://bafenav.htciaconference.org/uploads/1/3/1/6/131606490/8144996.pdfIn PDF document text
    • http://files.catherinereilly.com/uploads/1/3/1/4/131483138/3803139.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/1/0432/5936/3488/files/piroluzut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/9865/6158/files/how_to_bind_noclip_csgo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6660/5219/files/78987952176.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66916333827.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4481/2438/files/2262518354.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6509/6857/files/66373926855.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/nisumabame.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0695/0561/files/godwin_s_cabalistic_encyclopedia_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4388/1114/files/kuzunifobediratadu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2388/2650/files/pituninumusegi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6913/7305/files/nezojovodumabisudidebikif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4832/1702/files/soredaropesebiron.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7434/5365/files/10710236431.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5280/1954/files/bugeserapujekis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/6791/1842/files/approximation_algorithms_vijay_vazirani.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5349 5740 bytes
SHA-256: 907dc99ab8a7e90ec08ed9ad89aded645ec39d732cdb2fa6b49412d479489077
font_01_sfnt_off000066b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B6 9684 bytes
SHA-256: fc7a8d429641512803ecbcad36d649759ed7e31dedede0b5a3c9760b6f023ea0
font_02_sfnt_off000087bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87BF 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f