Malicious PDF — malware analysis report

Static analysis result for SHA-256 961cd95953793e2f…

MALICIOUS

PDF

41.6 KB Created: 2020-08-31 15:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25f72551a1509db1b2783142495b6138 SHA-1: e6112966db0a74e55f9001f4ea9e5065106eb031 SHA-256: 961cd95953793e2f557ff88121fab39e3dd71ff933fef331f8789546fd54b57b
130 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and text suggesting a lure for 'free printable worksheets'. This indicates an attempt to trick the user into visiting a malicious site under the guise of educational content. The presence of numerous other PDF links, while mostly benign, contributes to a link farm strategy.

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.
  • 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
  • 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/pify?keyword=free+printable+worksheets+for+1st+grade+pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/jelaja.pdf
    • https://cdn.shopify.com/s/files/1/0430/8828/1761/files/xinifopupabofofalet.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/pavij.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/guitar_rig_5_pro.pdf
    • https://cdn.shopify.com/s/files/1/0433/7388/7649/files/kefivivawipotopukewovek.pdf
    • https://cdn.shopify.com/s/files/1/0435/1698/5508/files/47502360821.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a6ee4b485994e83a8f61d18f6b92ae3.pdf
    • https://static.usrfiles.com/ugd/0a593f_8e7c4ac5f6fd4cee944d4545218c87ed.pdf
    • https://static.usrfiles.com/ugd/f1d680_d265a8e48a6c487b9fa528eced5f87f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_f49eabad86f048a197efaeb994fdb866.pdf
    • https://static.usrfiles.com/ugd/5926b4_0560ecab98b343fca27f0904fe1f62f1.pdf
    • https://static.usrfiles.com/ugd/769f78_0966da7eb4bb4a83a525eea645a005cf.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_off00005f29.bin
5a436e33dc35121093cc2d1181064aaf31c470aaef4319c5e734f8621ae9a495		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F29 5604 bytes
font_01_sfnt_off00007247.bin
1d99de2830fd9ed845ddfa08b62589836da5bf9eaa04d249d7defc63222fa694		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7247 11604 bytes

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