Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a24e4e4d8152d42…

MALICIOUS

PDF

34.8 KB Created: 2020-09-01 12:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a15ca66452d89ec5c023288bd0faaff SHA-1: 217e858faf20f7b9291b7d917c24461ddd5b75e7 SHA-256: 6a24e4e4d8152d42f6b4630755f5e81eb065391bbb26cf1d3a41f8129ee72bfd
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to other PDF documents. The primary malicious URL identified is 'https://ttraff.link/wix?keyword=adare+agamaki+sandun+perera+song'. The presence of a 'download button' heuristic suggests a lure to entice users to click on these links.

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.link/wix?keyword=adare+agamaki+sandun+perera+song
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/0aab01_67f31a3c9e564ef7b73c6ab1a6f5e135.pdf
    • https://static.usrfiles.com/ugd/b8c837_07761a20b169468d989b6dfce4f0a24c.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_e694c9a8db094db890c14ccf5c3d9fe6.pdf
    • https://static.usrfiles.com/ugd/19ce5d_4c3c40adff3748a08f3eb6067c7ade4f.pdf
    • https://static.usrfiles.com/ugd/9734e7_0ad56015ba5b47c69e45095340365abc.pdf
    • https://cdn.shopify.com/s/files/1/0431/9235/2928/files/9223241328.pdf
    • https://cdn.shopify.com/s/files/1/0430/8402/1921/files/jorijagoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2294/1351/files/85814751444.pdf
    • https://static.usrfiles.com/ugd/b8c837_15b571ccc55447868505cbab9e834b35.pdf
    • https://static.usrfiles.com/ugd/d775a9_b22bcf9a27484b17aa55ba9032cd6da8.pdf
    • https://static.usrfiles.com/ugd/b8c837_9598cd4bcc004f8ebc6a8e483cf660ae.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003fb8.bin
ea565f94a9fd7bfaed26e4915936cbcb5f07d6b2136c013e003ceeec57cd29fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3FB8 5104 bytes
font_01_sfnt_off000050f0.bin
9633f13b33162ef4cdf797ff8b52df90a9d0e002daaf4f94ba1257ebee51f6d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50F0 9288 bytes
font_02_sfnt_off0000709b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709B 4324 bytes

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