Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbf3e45c17dde2a…

MALICIOUS

PDF

38.5 KB Created: 2020-08-09 21:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ffa10b0cd00c14b9f8ec5aa407b394d SHA-1: 250f618fb584879b44cc729da127fa61776d2c36 SHA-256: acbf3e45c17dde2a866df91f818ae61b27dc3368861e1b3307bb539a8dec427f
138 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=chander+pahar+story+in+bengali+pdf+download'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs hosted on platforms like Shopify. The document body, though heavily obfuscated, contains the same redirector URL and a benign-looking PDF title, suggesting a lure to trick users into clicking the malicious link. No scripts were extracted from this sample.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.cc/pify?keyword=chander+pahar+story+in+bengali+pdf+download
    • http://files.kimrichardsart.com/uploads/1/3/1/3/131380756/poraloje-robagolofovojid-lijovow-sitateribisikef.pdf
    • http://files.myhandmadehome.com/uploads/1/3/1/4/131452842/riwemadiwonob.pdf
    • http://pezexolop.sonriabody.com/uploads/1/3/0/7/130739385/namogominizelosat.pdf
    • http://files.shineskillsforlife.com/uploads/1/3/1/1/131163736/f919b553.pdf
    • https://cdn.shopify.com/s/files/1/0435/5633/9871/files/54185526396.pdf
    • https://cdn.shopify.com/s/files/1/0432/0120/0289/files/waxudazinonifonikaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/92758092796.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/23187623473.pdf
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/pdf_file_reduce_size_mac.pdf
    • https://cdn.shopify.com/s/files/1/0433/9928/2845/files/mifajojogifew.pdf
    • https://cdn.shopify.com/s/files/1/0429/2299/9964/files/borana_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0428/9809/6284/files/multilingualism_advantages.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3431/files/3385354480.pdf
    • https://cdn.shopify.com/s/files/1/0430/4132/5207/files/dogab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0433/2814/3510/files/rutuxivavaxixegaxunopepez.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/business_communication_today_13th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/9550/6592/files/tasizotu.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_off0000572e.bin
0ad972614a031b30a28916bf897e8aca123c3678ec89a152209fb23f3b46a6d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x572E 5540 bytes
font_01_sfnt_off00006a0f.bin
0ae7afd282a55131fb7313d318c7d2f9bd1b29a9ddbe30caaba1e610c6ba9f40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0F 10148 bytes

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