Malicious PDF — malware analysis report

Static analysis result for SHA-256 4911fbff941afab2…

MALICIOUS

PDF

45.3 KB Created: 2020-08-16 11:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6922be6623a44686a41268fa8c485c4f SHA-1: 8d1b7eb556fad0b581f3bb3f8815f59d0f94264f SHA-256: 4911fbff941afab2f0081b222183c9e3c188e4a9fcad8841da3547e3a6057906
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'free preschool coloring sheets' and includes the malicious URL. This suggests a social engineering lure to drive traffic to malicious infrastructure. No scripts were extracted, and the PDF structure itself is the primary vector for the malicious redirection.

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+preschool+coloring+sheets In PDF document text
    • http://files.khaagwa.org/uploads/1/3/0/8/130873983/a14dba72934e99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2166/2365/files/fifudigafufageb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/84730511749.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9296/7581/files/bamiyan_menu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9693/2505/files/pixuwurevatalage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2979/8818/files/kizuxixelawez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6589/2245/files/gobuxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/7742/2494/files/pawufewalof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6955/2293/files/590321950.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/zavot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2956/0481/files/whatsapp_status_punjabi_love.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8375/9765/files/72164461334.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67DA 4728 bytes
SHA-256: 3249e8c3706b0a86f89f7879dc9d522616288b8e4ee255d48f1eea5dbc3e7c27
font_01_sfnt_off000077db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77DB 10036 bytes
SHA-256: de14ccc17b37cb4a915ec1b58818d1f0fe19c32eeb5de8c8c4b4ae4910aa6745
font_02_sfnt_off00009a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A36 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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