Malicious PDF — malware analysis report

Static analysis result for SHA-256 9272b496a16efa45…

MALICIOUS

PDF

40.9 KB Created: 2020-10-01 21:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: c38c914cbfa2432b01bf1bb9262f274b SHA-1: b8d643f777da212c777bd26ed1753d31f988a88d SHA-256: 9272b496a16efa45ed591e6359b1897abb41c93e379c2bbf3f666acadec34cee
194 Risk Score

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://ggtraff.ru/strik?keyword=pdf+split+and+merge+download In PDF document text
    • https://site-1036702.mozfiles.com/files/1036702/17077285083.pdfIn PDF document text
    • https://site-1036987.mozfiles.com/files/1036987/48361768721.pdfIn PDF document text
    • https://site-1037279.mozfiles.com/files/1037279/kozugafimoli.pdfIn PDF document text
    • http://files.sachettadesign.com/uploads/1/3/2/8/132814900/nirebagowunozojati.pdfIn PDF document text
    • http://kavaxo.arippleeffect.ca/uploads/1/3/2/6/132681352/3f53bf5f57d434.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/145bf3ae-1670-4983-a082-a95136b5391c/jopuxipetidelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd59e5b0-ff49-47d0-b73d-c46a2c0f3ef0/pavavasolazuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f2abc4e-db0a-4a92-b557-e763e161f314/bebisudazutezutenegeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/292ac851-ca6a-47ad-9ee4-c3b04962298d/tigos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c05f5b0e-6c29-4fa1-a350-94620cf477b2/4855689739.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/3185/6805/files/gypsy_musical_script.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/active_learning_template_system_disorder_preeclampsia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4321/1432/files/38183210594.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8673/6286/files/gems_of_war_classes_kingdom.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_off00006137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6137 5456 bytes
SHA-256: b81273f2951a7ada087611ab4009cfd381ca3e8b0021417716331da7eb1e5bf4
font_01_sfnt_off000073c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73C6 10344 bytes
SHA-256: d4b6274bf3536a52860a874ba80a07007f0e9161411a538866619d531c721019

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