Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b81ef296ea2d99f…

MALICIOUS

PDF

42.5 KB Created: 2020-08-14 15:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5adcf4f56c5bab0c686a7e0b3f49affd SHA-1: 38973d8f4913180d7b7e070fc0c774165ca3db93 SHA-256: 3b81ef296ea2d99faba03dbe57d824e58dc6265843c256242c622770478993c5
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection strategy. The primary URL, 'https://ttraff.ru/pify?keyword=picture+story+worksheets+for+grade+5', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to educational content and the malicious URL, indicating a lure to potentially 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.ru/pify?keyword=picture+story+worksheets+for+grade+5 In PDF document text
    • http://files.seedsforthejourney.com/uploads/1/3/1/3/131379306/vokijelikurat.pdfIn PDF document text
    • http://files.jupitersdream.com/uploads/1/3/0/7/130775245/4480888.pdfIn PDF document text
    • http://nekoxeliv.staeblestudioa.com/uploads/1/3/2/8/132814900/8929853.pdfIn PDF document text
    • http://files.wild-tiger.org/uploads/1/3/2/6/132695397/4662858.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/1/0436/2698/7680/files/rupor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/64462039419.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0766/2490/files/anlage_kind_2020_ausfllbar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7788/6371/files/29806831721.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/maretiru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3820/2273/files/jivasefawetu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0278/0057/files/uga_history_exemption_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/binomial_probability_distribution_examples_and_solutions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8257/0136/files/luwabukina.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6713/7438/files/74599286332.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/xuvazobadebomosux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2572/6614/files/btech_malayalam_movie_whatsapp_status_video.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 4

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_off00006689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6689 5636 bytes
SHA-256: e91e5b949892e537866600b6349eca063e133c2d3f2c55d7269bc23dc2ecb30a
font_01_sfnt_off000079c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C8 10176 bytes
SHA-256: a397e4d261e09b98fa429fa992bb59a23a09f36c654f5a649f86911087cc96de

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