Malicious PDF — malware analysis report

Static analysis result for SHA-256 941175e11c4b8ed2…

MALICIOUS

PDF

41.2 KB Created: 2020-09-30 04:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-12
MD5: f9a94815d7291416a762d059f0bfebe0 SHA-1: e1dd3ec049eec58bf20981f87ea6353b7b66c9a0 SHA-256: 941175e11c4b8ed21b372fc746d8e6978084a82cb8a0a6f74608202787682536
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, disguised as an IELTS vocabulary PDF. The ML classifier strongly indicated maliciousness, and the document body itself contains the malicious URL. This suggests the PDF is designed to redirect users to a malicious site, likely for phishing or malware distribution.

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://gettraff.ru/strik?keyword=ielts+exam+vocabulary+pdf In 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/1/0434/3260/7894/files/python_list_peek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7485/5846/files/fixed_assets_on_balance_sheet_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/4016/7320/files/fijexetugi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/tagovupatozajifuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ea3be5-ab83-457d-8518-3280049a24d0/33810307496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f6f33a-a725-46d7-b682-f6d330118696/gifaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b90e26d-108e-4c0a-a243-f8f7123a9cde/ronutulalabedomura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51ad496a-660b-4236-891e-c8b34be63fe4/kegirazagozuzufixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/632185ee-a93e-47a7-b0b4-d55efb68d363/vubofirevonolabidobi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3655/1579/files/kinetic_molecular_theory_of_heat_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3463/0554/files/28239554099.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasidobedibugamis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/60976333459.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5143/4652/files/wupidojun.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6223 5608 bytes
SHA-256: 012d698992c7209f85a8bb4da57d4925cbc237821ba6e84bf7a7ba8693fcc6b7
font_01_sfnt_off00007529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7529 10228 bytes
SHA-256: 439a742aa84adaa75e68eff133676d324b575a92ea2e3c848ab95777ee21343c

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