Malicious PDF — malware analysis report

Static analysis result for SHA-256 830ec65782ef4b66…

MALICIOUS

PDF

41.7 KB Created: 2020-08-08 20:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 00d5bc1b1455961870f8a43d66493cd5 SHA-1: dae10367c06c5cc74677039cdf95905b04ab4d0a SHA-256: 830ec65782ef4b66774c1e4e4f2cc41d37c192c494a4fa7ccc2f364061fac50e
194 Risk Score

Malware Insights

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

This PDF document acts as a lure, disguised as educational worksheets, to redirect users to a malicious SEO link farm. The primary redirector URL is https://ttraff.ru/wb?keyword=english%20practice%20worksheets%20for%20grade%205, which then leads to a collection of other PDF links. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points to a link-farming or phishing attempt.

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.ru/wb?keyword=english%20practice%20worksheets%20for%20grade%205 In PDF document text
    • http://files.sanmarinogirlscouts.com/uploads/1/3/1/4/131482953/xumilufefi-ditobebu.pdfIn PDF document text
    • http://files.jenracine.com/uploads/1/3/0/8/130874658/metefikijijip-sawuzob.pdfIn PDF document text
    • http://files.lollipopsisters.com/uploads/1/3/1/4/131454984/8910647.pdfIn PDF document text
    • http://files.windsormontessorischool.com/uploads/1/3/2/6/132681501/datafe_pogumavolabe_tuguxuzav_femokanigogedif.pdfIn PDF document text
    • http://files.mmzurita.com/uploads/1/3/2/6/132682335/f729c23.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/1/0434/3513/1036/files/civic_education_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/icasa_act.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3359516262.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pajovi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/62114329075.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5520/9879/files/vafamiparapesakamuvojoduv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2202/3847/files/38005115635.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/wamolawupivaxas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/nomago.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2890/5127/files/lofalu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1527/2605/files/23390277879.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 8

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_off0000644d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x644D 5652 bytes
SHA-256: 8e95049167a191f69a261d1e957e97c7a921601fe38672c06edda512f933f854
font_01_sfnt_off0000779f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x779F 9968 bytes
SHA-256: 10b54dc4cdec4fcbdceffc28c005caeb959a195589a20f83b489f9bdee042b4d

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