Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4cb9b4e6433abd0…

MALICIOUS

PDF

43.7 KB Created: 2020-08-22 00:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 109649e0dae97dbbd15b38b242c7cc83 SHA-1: 8fdfd370c93d9bf83474571f83d2806c13cd2ec1 SHA-256: b4cb9b4e6433abd04dfa8008fb17b2682c14ec3d9b2f4ee453925557539931ad
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to Shopify-hosted PDF documents. One of these URLs, 'https://ttraff.cc/pify?keyword=original+baybayin+font', is flagged as a malicious redirector. This suggests a campaign aimed at distributing malicious content or phishing users, leveraging a large number of seemingly benign links to obscure the malicious one. The presence of a 'download button' heuristic further supports a lure-based attack.

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.cc/pify?keyword=original+baybayin+font
    • http://files.justicefordrew.com/uploads/1/3/1/3/131384709/fowoxitizuwobudu.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0745/files/ghost_evp_analyzer_app.pdf
    • https://cdn.shopify.com/s/files/1/0427/8288/4006/files/joretamubatomufixejuga.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/18986152718.pdf
    • https://cdn.shopify.com/s/files/1/0427/9789/1751/files/30156707039.pdf
    • https://cdn.shopify.com/s/files/1/0432/6529/4504/files/ansiedade_autocontrole_augusto_cury.pdf
    • https://cdn.shopify.com/s/files/1/0437/4501/8017/files/31745614060.pdf
    • https://cdn.shopify.com/s/files/1/0437/0271/4536/files/missed_abortion_journal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/zonepejuwukaduduxip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005901.bin
e76342d2588a2b01400f3fb8971f10bf5df8ad3f5978c9f94a30df1dfe282fb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5901 5024 bytes
font_01_sfnt_off00006a30.bin
3fab90b432513c6d50e9409d53189b73507a3cc00055928330676365800b9c9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A30 10356 bytes
font_02_sfnt_off00008da4.bin
ce90dcb8f80a691a226d66d7b9fb40db13b52946125f6d312f8860abae454107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA4 16084 bytes

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