Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a85474ce24a333…

MALICIOUS

PDF

45.4 KB Created: 2020-09-12 20:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: aeea36925d55e377099bc4d8718d7de5 SHA-1: 2d3e23f516a1bcdcacc642be62ca7c43c0f76daf SHA-256: 31a85474ce24a333ac51a9e97451f16133b42a883e6442c4e4d65ca200e09b4e
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://ttraff.cc/pify?keyword=all+super+saiyan+forms+1-100 In PDF document text
    • http://files.birchbrook2.com/uploads/1/3/0/7/130775968/5022723.pdfIn PDF document text
    • http://files.galitgovezenskyphotography.com/uploads/1/3/1/4/131406149/212632.pdfIn PDF document text
    • http://gamuzije.trducks.com/uploads/1/3/2/7/132740249/dewugusifurori-feron-zisuj.pdfIn PDF document text
    • http://files.victoriaghairdesign.com/uploads/1/3/1/4/131483110/somapul_fotaboko_bigevox.pdfIn PDF document text
    • http://nosomevi.tylermartincis.com/uploads/1/3/0/7/130776407/46a97.pdfIn PDF document text
    • http://files.worldsate.com/uploads/1/3/1/4/131407823/paraka.pdfIn PDF document text
    • http://files.birdiphotography.com/uploads/1/3/0/8/130813701/dusonobadude.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/1/0430/5892/1621/files/labawuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5864/1573/files/29175844760.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/79263282342.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/fedisuzoriruleravebasikan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2243/4972/files/arcgis_pro_symbols.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/83e24f_737b67d41648432581dfea0fb6c05ed8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9904c2_7bfc67b409d24ef0805f9e29cd54d1dd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e02969_f743fa7a9935410281db142c4086a009.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/866690_f41db3ac28f14b95b80e812aa29fd1c9.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_off00007268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7268 5364 bytes
SHA-256: 434761709bdcd4c3b4baf9f61235a89cb8f133e27b5a7fe1038e0f83b1b7e0a2
font_01_sfnt_off000084a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84A6 10148 bytes
SHA-256: ebb52aa579a55b6f93700748a1cb4f45967307218c80ef2a8619f6a4f0ac04c8

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