Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5317db2e0cd5b4…

MALICIOUS

PDF

41.7 KB Created: 2020-07-08 17:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16b113915e7cd357340a2195bb6cc8d4 SHA-1: 3a9f5cf831fa87e71acfeea1ab51c846b85e6172 SHA-256: 0a5317db2e0cd5b47d0a32eac6332ce632055fd9d635640c2a11ff6f27f60b78
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, identified as a link farm and a malicious redirector. The primary URL, 'https://ttraff.cc/wb?keyword=flashcards%20maker%20pdf', suggests a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, and the presence of many external PDF links indicates a potential SEO manipulation or content distribution scheme. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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.cc/wb?keyword=flashcards%20maker%20pdf
    • http://files.pcochoir.com/uploads/1/3/0/7/130739658/xijofidipej.pdf
    • http://files.lindyjames-christenson.com/uploads/1/3/1/3/131379612/3953267.pdf
    • http://files.newyorkstategrandcouncil.com/uploads/1/3/1/4/131437538/bapemo.pdf
    • http://files.oceanwisejourneys.com/uploads/1/3/0/8/130874647/bojeb.pdf
    • http://files.purpleinkpublishing.com/uploads/1/3/1/4/131437844/mikofoxaxomojope.pdf
    • http://files.shine-bu.com/uploads/1/3/1/8/131858481/zuvawozupami.pdf
    • http://files.counsellingpsychologist.services/uploads/1/3/0/9/130969555/7582248.pdf
    • http://files.finderskeeperscafe.com.au/uploads/1/3/1/3/131398134/xibokesedi.pdf
    • http://files.missjordansclassroom.com/uploads/1/3/0/7/130776841/5406440.pdf
    • http://files.diabetest1ireland.com/uploads/1/3/1/8/131872285/3740429.pdf
    • http://files.frontrunnerbooks.com/uploads/1/3/0/7/130740127/238d271698fcd5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bijetukexer.files.wordpress.com/2020/06/vejikelodazejisu.pdf
    • https://vunafafop.files.wordpress.com/2020/07/20213910368.pdf
    • https://verokizafiwi209368049.files.wordpress.com/2020/07/83602106133.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74832969368.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8007882555.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005447.bin
07763d754c9db3d2b4a2da7457be10f6a51e5217a0d2a87122862815b52eaf24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5447 4856 bytes
font_01_sfnt_off000064bc.bin
2ef3c66245935fc73d40eb279b20a0b7b1993f3120606d7df544afe8e87ce88a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64BC 9416 bytes
font_02_sfnt_off00008534.bin
37e7e7e9114bd13ff8332e6897528b8343bfbb4b2dd84d96d31ee0d9080a0a97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8534 16096 bytes

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