Malicious PDF — malware analysis report

Static analysis result for SHA-256 de00bdf49f15f486…

MALICIOUS

PDF

41.0 KB Created: 2020-08-10 10:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3018c22bfb05d898b18ac7cb57c000db SHA-1: 607bc3939056f432ab30a367c76c8e27096cc853 SHA-256: de00bdf49f15f486c5367b902ed1c34753e67552b0d40dd9b6a2e8ad45151e85
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.com/pify?keyword=brush+lettering+worksheets+pdf, which is likely used to redirect the user to a malicious site. The document body itself is heavily obfuscated but contains references to the malicious URL and other benign-looking Shopify links, suggesting a lure to download further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.com/pify?keyword=brush+lettering+worksheets+pdf
    • http://files.theliberatorylibrary.org/uploads/1/3/1/8/131856234/juzuwen.pdf
    • http://files.barbarablumenthalehrlich.com/uploads/1/3/1/4/131455621/tatufolamukuv-jezejur-nefajip.pdf
    • http://files.sarahthurstensondesign.com/uploads/1/3/0/7/130739069/9421336.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1715/files/83500847620.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4637/files/getapinupilejezugiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/bigowijimawobetasuzer.pdf
    • https://cdn.shopify.com/s/files/1/0438/3434/3574/files/wedding_cake_recipes_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/9238/5700/files/8114035754.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45366335679.pdf
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/12931478439.pdf
    • https://cdn.shopify.com/s/files/1/0432/3636/0351/files/gupugunoziwujexelurar.pdf
    • https://cdn.shopify.com/s/files/1/0437/6952/8471/files/1718362411.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/95432261788.pdf
    • https://cdn.shopify.com/s/files/1/0436/2783/9641/files/vaxezidusikudafilixem.pdf
    • https://cdn.shopify.com/s/files/1/0437/7794/9848/files/gopivonozerogosuwominedid.pdf
    • https://cdn.shopify.com/s/files/1/0436/6575/2217/files/partes_del_baumanometro_y_estetoscopio.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006273.bin
0ad4c7d5c266495c728699db2f75eeafc9c35301392edbadbaf42e2346ed86f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6273 5300 bytes
font_01_sfnt_off0000748c.bin
0c1cde3f87302f5d9e13f08a44de28ed920b2beca1b683d906ed447402ecd797		 pdf-font-stream PDF embedded font (sfnt) at offset 0x748C 10132 bytes

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