Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa174ae0c3b158ec…

MALICIOUS

PDF

41.6 KB Created: 2020-09-05 05:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a2f5a7d5aff7f9aba4f0850a32c0f55 SHA-1: 1e2e5f4b54b4eec0ecb03879d3ee772c8d25187e SHA-256: aa174ae0c3b158ecca05818ac0db80f3deedcfea1b95cca130484e4841a47159
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=reading+comprehension+worksheets+pdf+8th+grade'. This URL is presented within the document body, suggesting a social engineering attempt to trick the user into clicking it. The file also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which point to benign Shopify domains, likely for SEO manipulation to mask the malicious redirector. No scripts were extracted from this sample.

Heuristics 3

  • 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.
  • 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.club/wix?keyword=reading+comprehension+worksheets+pdf+8th+grade
    • https://static.usrfiles.com/ugd/9df9d6_f7a2e9f119594d99809f5860088a1fb8.pdf
    • https://static.usrfiles.com/ugd/b8c837_68e07adc3cec48a5ac8e7386976720b0.pdf
    • https://static.usrfiles.com/ugd/516793_6057a4d7e5c140d484ee36d7d8772df7.pdf
    • https://cdn.shopify.com/s/files/1/0440/2734/7109/files/android_studio_theme_editor_slow.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/modio_xbox_360.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/23517157979.pdf
    • https://cdn.shopify.com/s/files/1/0433/6821/8780/files/ajax_tutorial_w3schools_download.pdf
    • https://cdn.shopify.com/s/files/1/0465/5162/9974/files/canon_ip2770_printer_installer_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3534/4539/files/81408165856.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8007882555.pdf
    • https://cdn.shopify.com/s/files/1/0461/3482/1032/files/africa_toto_saxophone_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/1019/4582/files/offer_up_apk_2017.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_off00006105.bin
68c8b9c88a86a9ee15a6167d75be91d3f96473841c0c928da7377692f91d1526		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6105 5892 bytes
font_01_sfnt_off00007507.bin
60454c7bb04a942765d635e35ed72664afd0cabf74e55e68888e03796c99e91f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7507 11044 bytes

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