Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81b88d3cda423ef…

MALICIOUS

PDF

40.1 KB Created: 2020-09-09 19:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 03527ec21df9414d1d7c11e943a68ec8 SHA-1: d4d31c56e83f0bdaed144648418d35def348036e SHA-256: a81b88d3cda423ef1a42902df0b7ec61e93dcdf04d4563c70cc98e56ef606c80
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with malicious redirectors or link farms. The primary malicious URL identified is https://ttraff.ru/wb?keyword=abc%20tracing%20worksheets%20printable. The document body, though heavily obfuscated, contains references to 'abc tracing worksheets printable' and the URL, suggesting a lure to download or view these resources which ultimately redirects to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/wb?keyword=abc%20tracing%20worksheets%20printable In PDF document text
    • http://files.flynnscareerandcollegeready.com/uploads/1/3/0/7/130774970/5b781fb64548.pdfIn PDF document text
    • http://files.skinnykittyfarms.com/uploads/1/3/2/6/132695663/tudozerinura-boterozab-topun.pdfIn PDF document text
    • http://moxolutuz.usa-smoking-supply.com/uploads/1/3/0/7/130739602/4467006.pdfIn PDF document text
    • http://files.sweetpeatakeaway.com/uploads/1/3/1/1/131164168/pedizuruwir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/21e6f2_06599d69cdd5411d914177f88f42194c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1cc777_abe5c7d099d04e8e8932e65839841b87.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a6e5e9_79809fbac4354aa89f8e5ffde1cff258.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cb4a18_2eaf1f4ccafe4983a53cbd0367eabcc9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_3d2309370a324b2c9b9d451de9dedad4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e5412a_f1f260b3fd6347898f1704a005d57543.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/32777b_a31b4e9e29614beba2b7d3ca8e718249.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/80c1db_ea43857dc0494ee29cf61a6d136efab1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1161/2572/files/singapore_crs_reporting_jurisdictions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/submit_button_on_form_not_working.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9231/1206/files/kojoxux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2881/4741/files/auto-_update_map_from_google_drive_spreadsheet.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 4

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_off00005c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C82 5480 bytes
SHA-256: 28aea0df25b6b1f7e9cca2d7605d4fb593df884b20937e8740dd5dd5a25841e2
font_01_sfnt_off00006f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F34 10128 bytes
SHA-256: 238f584f2b62fbd13f086405ad0ce431537ee4c3ed93a29745b95049a3c01d3c

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