Malicious PDF — malware analysis report

Static analysis result for SHA-256 442b61e6ab0dc12a…

MALICIOUS

PDF

50.2 KB Created: 2020-09-09 16:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: df282ecd85d4f2dc8bc93067feb7f0e7 SHA-1: 4d0667626dd1b47857ecb30d5db6a6dfe60fb48d SHA-256: 442b61e6ab0dc12a6ecd1030a93946f7798cf6154c527d910c921c3f25ac9a54
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=epithelial+tissue+worksheet+answers', suggesting a lure to a malicious site. The presence of many external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content.

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=epithelial+tissue+worksheet+answers In PDF document text
    • http://files.bhumikafest.com/uploads/1/3/1/4/131454172/e0275.pdfIn PDF document text
    • http://kirul.truevinelifetab.com/uploads/1/3/0/9/130969754/dodamitibonodo_nisobi_welar_wuleg.pdfIn PDF document text
    • http://files.herbalmedicinecanada.com/uploads/1/3/1/6/131637279/91c0a542600.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/9c43ec_8acce02737a147e4b90e0f0d4a717432.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b7ab08_b169f5d37f73454b861a792f3cbc3425.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d99ef3_34cc6f1dbcf84c228eb9231dbc0d9443.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c33f71_837582dbbee14235b11fcf530522d0a5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/314c35_68146dd758a14d89ad4c58eaeff7cf1e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/41a0b6_26363d9f33b94922be2a47a2d9cc95c0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e5412a_bf06c118d6bc4ff78709a0b909e1f2a7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cec570_29b835fe6c91439aa429dbf0db9ff389.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/25c42e_90cd5a88fca54a5b9a3b043b7657345e.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/tutakitimu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2231/7728/files/arrange_numbers_in_ascending_order_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3127/3370/files/xowojom.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 2

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_off00008821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8821 5020 bytes
SHA-256: d3ad434b8ce9f509b7fcf7b80f05d23cbc35537ee429c6d52615ad4509305b21
font_01_sfnt_off00009941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9941 10244 bytes
SHA-256: e7960d9b6ea7465044688e4bfa5f9e3610fe1c7c7e2122d34b495e6e8350d284

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