Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d21f38bf8924df…

MALICIOUS

PDF

57.2 KB Created: 2020-08-22 07:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5ec3154396d620c0067161abb038afd0 SHA-1: 8101dfafa05ebca454a3792536b3192545fe91b7 SHA-256: 23d21f38bf8924dfb9acd9d5f36593eed1db1e4e4233f97233d30f167dcbbe7b
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, identified as a link farm, with one critical heuristic firing indicating a malicious redirector. The embedded URL and the document body text both point to a lure related to 'dulcimer sheet music free'. The primary malicious IOC is the redirector URL, which is likely used to serve further malicious content or lead to a phishing page.

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.cc/pify?keyword=dulcimer+sheet+music+free In PDF document text
    • http://files.mollymurraybirthdoula.com/uploads/1/3/2/6/132696077/1874681.pdfIn PDF document text
    • http://xovima.weplaysotheycan.com/uploads/1/3/1/4/131483418/dexokozilipexerozoku.pdfIn PDF document text
    • http://files.discoveringtheremarkable.com/uploads/1/3/1/8/131856034/zifiv.pdfIn PDF document text
    • http://files.isleofhopesteam.com/uploads/1/3/1/4/131454034/vivafojujite_lewopuwuf.pdfIn PDF document text
    • http://batebibu.softerthanbrittle.com/uploads/1/3/1/4/131407089/2348155.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/1/0431/4087/4408/files/schindler_s_list_theme_music_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4123/2795/files/fimanajaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5847/0822/files/51792411557.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2016/3999/files/benzodiazepnicos_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/pasobapuxoberagilap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2429/3794/files/i_ve_got_big_balls_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8899/3703/files/manual_backup_iphone_to_icloud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5747/8823/files/72257074574.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/carnatic_flute_lessons.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3939/0872/files/bibawiwod.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 7

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_off0000a449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA449 4908 bytes
SHA-256: 5659ebf759f346791389c404b652197b22c202993bd7ccbea2b43610d76249c9
font_01_sfnt_off0000b4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DB 10208 bytes
SHA-256: 09532641e3fcda3a87b5205ecbea57f9bacd6bd63cd383efba31924cdcb85726

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