Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d7196b176fba6d…

MALICIOUS

PDF

44.1 KB Created: 2020-10-10 02:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 82e0eddcaf9b8bcbf583eb8fc2f98d39 SHA-1: 9e944c706511da7cda9dde510dd46091a384ea2f SHA-256: 33d7196b176fba6dcb3199244278776d10b71b5104080d3e79771f1a11f2afd1
192 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious infrastructure, identified as a link farm. The primary redirector URL is https://cctraff.ru/strik?keyword=science+olympiad+circuit+lab+practice+test, which then leads to a series of other PDFs hosted on disposable domains. This indicates a campaign to distribute malicious content or phish users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?keyword=science+olympiad+circuit+lab+practice+test In PDF document text
    • http://files.robynfear.site/uploads/1/3/1/3/131380467/adf5b71ee5.pdfIn PDF document text
    • http://files.simplyinspiredrentals.ca/uploads/1/3/1/3/131398367/nomewefozufak.pdfIn PDF document text
    • http://files.troyamsti.com/uploads/1/3/1/4/131455337/ziniraremimazubugaga.pdfIn PDF document text
    • http://zujuzasi.nissajackman.org/uploads/1/3/2/6/132681072/5402445.pdfIn PDF document text
    • http://zumaz.churchofsaintmarks.org/uploads/1/3/1/4/131408027/9314396.pdfIn PDF document text
    • http://vatijubik.doloresrocket.com/uploads/1/3/0/9/130969265/xegafa.pdfIn PDF document text
    • http://bubijuna.deborahshepardbooks.com/uploads/1/3/1/0/131070420/wezet.pdfIn PDF document text
    • http://files.writersabodeen.com/uploads/1/3/0/7/130738759/nenurixami.pdfIn PDF document text
    • http://pedaleviw.maskellsmindmatters.com/uploads/1/3/1/3/131379409/7496362.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/1/0438/4499/3181/files/macromolecules_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578042bc-df7d-448e-845b-845cb10608eb/moval.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e40443a9-ffd3-49e9-aa68-1ab890c68755/32990894232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc1083e-d292-43e0-8515-c8ffc14c5b45/nemelodisonomiti.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_off0000629d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x629D 5564 bytes
SHA-256: 1dfe15f3018f5b2583b078c14c289a7d5e3f8f7c09ee29670f855441c65eb1f8
font_01_sfnt_off0000756d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x756D 14908 bytes
SHA-256: 9a1fdfec4122e5bfda72472dc5d6e0635ee4ae56a5ca27647cd9b4c9a507f1ea

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