Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a77bd54d289cb20…

MALICIOUS

PDF

48.1 KB Created: 2020-08-06 22:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e6ae09b27571a7619a616ec1866faa6c SHA-1: 493ea14396f7c8225a2005c55907e418d6bb0cce SHA-256: 1a77bd54d289cb207769595e64060b113183daeb91b0a196e93b02b103fb0336
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one link pointing to a known malicious redirector. The document body, though obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=oxigenoterapia+pdf+enfermagem', suggesting a lure to trick users into clicking through to malicious content. The ML classifier strongly indicated maliciousness.

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.cc/pify?keyword=oxigenoterapia+pdf+enfermagem In PDF document text
    • http://files.29wildcats.com/uploads/1/3/0/9/130969680/kazazefobupudiv.pdfIn PDF document text
    • http://files.theunquarantinedmind.com/uploads/1/3/0/8/130874330/gotakipise.pdfIn PDF document text
    • http://files.jsandlin.net/uploads/1/3/0/7/130739750/94b6b968e4.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/1/0429/3227/3319/files/64649171963.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6769/4501/files/79362123933.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1492/1112/files/bavepijuwolewenebokunap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/4741/3910/files/beginner_english_grammar_test_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/delete_commit_git.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/rozeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6193/6282/files/bovamadagobixukexirikobu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8279/2606/files/25394026871.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/7346246587.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6458/0501/files/bajaj_finance_loan_approval_letter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/lawedasavubejejetegixotop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0708/0608/files/statistics_freedman_4th_edition_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/lonmin_bursary_application_form_2020.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_off000074a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74A5 5248 bytes
SHA-256: 576fa53cac5f1f7d9b69c2bad8c275fafec48b24d458d40e357d83f93ff49181
font_01_sfnt_off00008674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8674 14752 bytes
SHA-256: f25f07d3a96f4eb09a21b9d9800d8b7bd45d8552712986a854cd2a66ef963f08

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