Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1c3bef541641cf…

MALICIOUS

PDF

49.9 KB Created: 2020-08-25 18:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2c5a18c8e06d7513093a4e61ae5f8089 SHA-1: d2fade76969144329c7fe016cdec656d3661676d SHA-256: 0b1c3bef541641cf2517767e3985c6ad0e3a968181eaf7f472caa5b287818673
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service (ttraff.ru) that is flagged as malicious. The document body, though heavily obfuscated, contains text suggesting a lure for a 'free children's book template PDF', which is likely a pretext for phishing or malware delivery. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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/pify?keyword=free+children%2527s+book+template+pdf In PDF document text
    • http://gunalo.stmarkski.com/uploads/1/3/1/4/131437069/9783580.pdfIn PDF document text
    • http://files.sylvialowery.com/uploads/1/3/0/8/130814666/60a0bcda0.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/1/0435/5440/6561/files/apostrophe_worksheet_for_grade_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3927/6699/files/wasufajomozexowonokelif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/22886975220.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4923/8171/files/best_budget_android_smartwatch_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9582/5320/files/sogijasotat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/26892236932.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5545/6149/files/kosumazeka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3614/5814/files/cambridge_primary_mathematics_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9753/9231/files/glades_season_5.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 3

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_off000084e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E1 5588 bytes
SHA-256: 7410e943436388ef44619f71dee07120cadd77bc7483ec7344e078856dc9928f
font_01_sfnt_off000097ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97AD 10244 bytes
SHA-256: 6167d505078d4354fd90bbe746794818e96db3fea045b84dbdf073b50e823508

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