Malicious PDF — malware analysis report

Static analysis result for SHA-256 16548a3503c577cc…

MALICIOUS

PDF

35.8 KB Created: 2020-08-15 02:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 50a9d4d355c610fae76911b424e83069 SHA-1: a9a8e78746d6871b2b093b0a9547c0e35281e556 SHA-256: 16548a3503c577cc1f69ee62bf11ec2e5ea54f5233763943e9b61c7f881e1689
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service that is flagged as malicious. The document body and embedded links suggest a lure for free downloads, likely a phishing or scam attempt. The ML classifier strongly indicates maliciousness, and the presence of multiple external links points towards an SEO link farm or similar distribution technique.

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/pify?keyword=vertical+banner+template+psd+free In PDF document text
    • http://sitona.pattykeller.org/uploads/1/3/1/8/131871390/bekebiro.pdfIn PDF document text
    • http://files.panisangelicuspress.com/uploads/1/3/1/3/131384018/7094245.pdfIn PDF document text
    • http://files.desert-green.org/uploads/1/3/1/4/131454850/zabivoburox.pdfIn PDF document text
    • http://files.you-net.eu/uploads/1/3/0/9/130969689/bizusutapezu.pdfIn PDF document text
    • http://files.onlinemobiletrainer.com/uploads/1/3/0/7/130776266/4990596.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/1/0437/8345/4872/files/gapirujotenujabonabew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/tafirij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/amisom_mandate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8561/8583/files/xevemixuguxufidebi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2119/5688/files/78229748602.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0096/1947/files/jeguzawudajifulede.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/payroll_management_system_documentation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5010/6018/files/27272069167.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/42212347946.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/kannada_english_dictionary_app.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7850/8953/files/datufugeger.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_off0000527c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x527C 5408 bytes
SHA-256: 7b4e48092195262daee30c1f82d48943ab342a954d1e8ab2da07b906fe645883
font_01_sfnt_off000064bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64BC 8736 bytes
SHA-256: a9b3476c6a23e8b57759779b40f8223cd6930c83e9e4e0998be94085e060ded3

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