Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c73d9d43a2fd875…

MALICIOUS

PDF

36.3 KB Created: 2020-09-28 00:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 21faa6d7d22b8ae926f1f779380e6c4f SHA-1: 769cbc98d5155f0214c798e5bf2d698a53499073 SHA-256: 3c73d9d43a2fd8751c44a077165d389bca7ee5572f1e0e1ad84c11ec9d268cfd
202 Risk Score

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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.link/pify?keyword=how+to+clean+nightguard+reddit In PDF document text
    • http://sogulot.shapebham.com/uploads/1/3/1/4/131452958/e23ef01.pdfIn PDF document text
    • http://nipipade.richlandiowa.com/uploads/1/3/1/4/131438563/84710b02d370486.pdfIn PDF document text
    • http://pawom.marinanatalijewelry.com/uploads/1/3/1/0/131070792/pevofagel_bakajorevijuto_lotivivizoruje_runef.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/1/0464/6384/4520/files/zafaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9801/3850/files/love_alarm_webtoon_story.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3442/7047/files/critical_care_nursing_textbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4352/0666/files/16450827055.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4273/4229/files/gugigupapaditubetuwixa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/4733/8403/files/93351668190.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/28265042.pdfIn PDF document text
    • https://ebccd5bc-ee7f-4ed9-8aca-883de6e85e71.filesusr.com/ugd/69695d_8935c6a4506a4ada994617e4047d497f.pdf?index=trueIn PDF document text
    • https://8a9f0b72-99de-43c6-bbd3-e3af39449cc4.filesusr.com/ugd/13ae68_c466ceaf511c4e73bd73022356a5699b.pdf?index=trueIn PDF document text
    • https://682a5b3b-42a7-4e6c-97db-69464a1bfc0a.filesusr.com/ugd/03a576_67811cc405a540028a6ae001e2fef8ca.pdf?index=trueIn PDF document text
    • https://62c09d6a-8608-47e3-b3c5-63fb14bcb305.filesusr.com/ugd/9f69bd_1f72c04962334273875cb8c4666835f7.pdf?index=trueIn PDF document text
    • https://9eed43c0-d93b-48bb-ad94-ccc4c1a2a485.filesusr.com/ugd/33ab24_38eea65829034880b96f04623f11ce04.pdf?index=trueIn 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_off00005105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5105 5076 bytes
SHA-256: 2ab1366821a401febf29c43691a0268be21689c5950556205409cc83a1eb9236
font_01_sfnt_off0000624d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624D 10048 bytes
SHA-256: 58d0ddfb767143ab151f37e258a7a8b5de35262771fae5ef105d22f855910156

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