Malicious PDF — malware analysis report

Static analysis result for SHA-256 50446dc3b9eda1ec…

MALICIOUS

PDF

56.9 KB Created: 2020-08-09 07:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7d7924748404bb138f2371da228cf3f3 SHA-1: 7eab2c5620cbac72609c8091d86812fc3e8a91e2 SHA-256: 50446dc3b9eda1ecedc145e582e9ce340e56eeeee9c22cb938ffd9cf63261c24
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'usmle step 1 biochemistry lecture notes pdf' and the malicious URL itself, suggesting a lure for educational materials. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO manipulation or to distribute malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=usmle+step+1+biochemistry+lecture+notes+pdf In PDF document text
    • http://files.nighthawkgolfcenter.com/uploads/1/3/0/7/130775350/muritizok_nidaxoxav.pdfIn PDF document text
    • http://files.eseryel.com/uploads/1/3/1/8/131857315/guxakatevudidi.pdfIn PDF document text
    • http://files.appliedmicronanolab.com/uploads/1/3/1/4/131411688/04d0cd9a.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/1/0440/5254/5701/files/d_d_3._5_phb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/31578321179.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4653/5322/files/jutibuzutomilibubadagobom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9462/9786/files/air_pollution_project.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5167/9898/files/afficheur_lcd_i2c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7577/8198/files/playboy_magazine_download_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5928/1048/files/84362433345.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6769/3474/files/who_s_afraid_of_virginia_woolf_script.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0896/6301/files/rawudexawavix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4505/1797/files/pernicious_anemia_pathophysiology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2971/6374/files/kagitoba.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
🗂 Part of campaign: appliedmicronanolab.com 4 samples

Related samples 5

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_off00009fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FA1 5472 bytes
SHA-256: f2076fa5af714baefcdf86b649937b80f9df9a891447b28d8c8d43a7f208b39d
font_01_sfnt_off0000b21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21B 10604 bytes
SHA-256: e1e83a383e7c8ee5f25e0874dc74b478692e50d4ae22950c1905590a003d45f1

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