Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ba8556fb712baa…

MALICIOUS

PDF

43.0 KB Created: 2020-08-13 04:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e064619d4a3b56706528f5215a8043d SHA-1: 10d07a1fba3d6cd95e5fddcb4f0f4c9eadbe5184 SHA-256: f0ba8556fb712baa4c0c1f3d31a00600a1919b96a814212c679f4dff6f894b98
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to link farms hosted on various domains. One critical heuristic firing indicates a direct link to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body itself is heavily obfuscated and contains a mix of seemingly legitimate text and URLs, suggesting a lure to external malicious content.

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.ru/wb?keyword=anti%20poverty%20programmes%20pdf
    • http://files.craftgalleryohio.com/uploads/1/3/1/0/131069819/ee91e29ded.pdf
    • http://files.tessiergourmet.com/uploads/1/3/1/3/131382092/dotokod.pdf
    • http://files.pugetsounddoulas.com/uploads/1/3/0/8/130814611/jederite-majuvisajujot-gisulosisiw-fozajoxobaz.pdf
    • http://files.ccireenacting.westhistory.net/uploads/1/3/0/7/130740222/83d1a0321c52c.pdf
    • http://files.fccfrankfort.org/uploads/1/3/1/0/131070692/zibufatawexitosup.pdf
    • https://cdn.shopify.com/s/files/1/0450/1677/6862/files/sogulabexeb.pdf
    • https://cdn.shopify.com/s/files/1/0439/8995/8814/files/bedewebefekudewosod.pdf
    • https://cdn.shopify.com/s/files/1/0431/6548/3172/files/acgih_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6375/files/kizepe.pdf
    • https://cdn.shopify.com/s/files/1/0432/7548/5339/files/aprender_a_dibujar_rostros_paso_a_paso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lawup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zixetirubopejama.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6339/files/faxikifazojo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1961/5901/files/kumixipowakevifozape.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/oxford_thesaurus_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/12621965181.pdf
    • https://cdn.shopify.com/s/files/1/0431/7960/6176/files/buzadevijidipewujujav.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_off000067c0.bin
4d755de7a43cd17339dfd2d7edf0ea4e50bf1f2e186e476169e65fcea67a5650		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C0 5480 bytes
font_01_sfnt_off00007a57.bin
5c505bbbbe6813dadadbfb34bce82d98fff2bde4267c29f831820111cbbe35da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A57 10680 bytes

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