Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c34e8b714b4505…

MALICIOUS

PDF

33.0 KB Created: 2020-09-10 03:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cbfde5cefd67a78dbac7950dc0d10056 SHA-1: 46d090259fd418bd53f2f941453ec25f6bea6748 SHA-256: 16c34e8b714b4505c57ed872d22e5f83c16477f9adcdd7ed89d7deff81567cba
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, suggesting a phishing or malware distribution scheme. The embedded URL and document body text point to a lure related to 'identifying silent letters worksheets', which redirects to a malicious domain. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to drive traffic to malicious infrastructure.

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.club/wix?keyword=identifying+silent+letters+worksheets In PDF document text
    • http://files.visualronin.com/uploads/1/3/1/4/131438819/8598117.pdfIn PDF document text
    • http://kimim.artbyronda.com/uploads/1/3/2/6/132682261/zepafebezilijeben.pdfIn PDF document text
    • http://tibepuru.ludworthandmellorwi.com/uploads/1/3/2/8/132814989/peluwaget.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/0b46e6_13a2757277da49ad81efef08554099b7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cfbfd2_cb7481fc3b104667bd61eece784f1e40.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6290de_840d709e8a534fd79d85e8b612263881.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bf0735_46bad7ccbc5446639eac715e76800278.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2853/6731/files/20113965453.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2f3216_9e2709e0594a4611bb8e1b980f303192.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/576447_99f4d307577b42d487cd38d7e6d7fcd5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e2c6c1_dee3528639a34a42be3768add4f5a01a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_73d299d862fd4e2e9863d1280a5e008d.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 1

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_off00004422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4422 5156 bytes
SHA-256: b3d0712503a2fd4d8cb6a18bcaa3d948ff09ff25710a7d390da0cb5814173833
font_01_sfnt_off000055c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55C2 9820 bytes
SHA-256: 254b43f984664c8629b8cd178a1b0c9683ba47ccce1b7da1878b00bffb62f85a

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