Malicious PDF — malware analysis report

Static analysis result for SHA-256 5daef8dfe5e5fe40…

MALICIOUS

PDF

40.4 KB Created: 2020-09-01 04:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f8b75098dd30307bb7953ec92cf4d29 SHA-1: 996a8e0f853bc392565e4798cc426b5a96d6d7b7 SHA-256: 5daef8dfe5e5fe40f2f380caca74ffe73608099d8b1a1c1de4e1bfa01636e00e
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'cursive writing worksheets grade 1' and a URL that appears to be a lure. The presence of a malicious redirector link and a large number of external links suggests an attempt to drive traffic to malicious infrastructure, likely for further exploitation or phishing.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=cursive+writing+worksheets+grade+1
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/8b4172_59448f87d99348308975894549e31522.pdf
    • https://static.usrfiles.com/ugd/de60da_a73e784b5bab4bbd9cefdefcc5208f31.pdf
    • https://static.usrfiles.com/ugd/b8c837_88e3500285b94696bd11af5ced4611ed.pdf
    • https://static.usrfiles.com/ugd/eb4c03_d600256caf1846499563d78b69ea2e32.pdf
    • https://static.usrfiles.com/ugd/735424_7ef8617267d2404092bffd8fd193b23d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7cd417099fbe43bab6571aadcc5f7d5b.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/bekibejixidod.pdf
    • https://cdn.shopify.com/s/files/1/0433/6192/7318/files/14999365236.pdf
    • https://static.usrfiles.com/ugd/30e015_86993c402fb840218d2a3c7f26e029a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_47b01ea49aa74de1afedc2d82526b3a0.pdf
    • https://static.usrfiles.com/ugd/f0e51d_40ae68868f3b4535a068a75423aeab1d.pdf
    • https://static.usrfiles.com/ugd/eed56f_440ac82c330343a5861a31b6aa7805e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_54e8b102048c4dca9b8bdb9a244ef5ac.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f1c.bin
d339b14a87e5e9c1473a2ec27cafc8e2c1a557fb1d3b9cc712e64a343fa4ca01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1C 5228 bytes
font_01_sfnt_off000070f6.bin
33c23d7c8fd48b20b8d06a1ba06e60391f454c073744ea0df710e674aa4ecb6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F6 9864 bytes

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