Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd8a0dba39d128e…

MALICIOUS

PDF

32.9 KB Created: 2020-08-07 11:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55343fd93fd9a59d42a459fe882e3101 SHA-1: 22ea601aa135acd1b5ecebbf1316c832795bf244 SHA-256: 1fd8a0dba39d128eecd1e01eaad90fda4d95028d9ca6e13de59a44f04604f846
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one prominent link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to IELTS practice tests and the malicious URL, suggesting a lure to trick users into clicking the link. The primary malicious URL is https://ttraff.com/wb?keyword=focusing%20on%20ielts%20general%20training%20practice%20tests%20pdf, which is likely used to redirect the user to further malicious content.

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.com/wb?keyword=focusing%20on%20ielts%20general%20training%20practice%20tests%20pdf
    • http://files.smalleyestate.myhackney.org/uploads/1/3/1/3/131381363/bopetusotelefa_wajifipiso.pdf
    • http://files.solitaryislandsgamefishingclub.com/uploads/1/3/0/7/130739871/172622.pdf
    • http://files.aafreda.com/uploads/1/3/1/4/131407138/noxadefofeb.pdf
    • http://files.dandridgesafaris.com/uploads/1/3/1/1/131163851/bovizukawonupuli.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdf
    • https://cdn.shopify.com/s/files/1/0431/5290/0250/files/gofigeguvaxis.pdf
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/mixelafusesi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1458/files/41281801418.pdf
    • https://cdn.shopify.com/s/files/1/0431/9313/9364/files/6502026735.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/42093746484.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7682/files/descargar_biblia_reina_valera_1960_para_android.pdf
    • https://cdn.shopify.com/s/files/1/0432/5143/3627/files/american_english_file_4.pdf
    • https://cdn.shopify.com/s/files/1/0436/5815/0046/files/redol.pdf
    • https://cdn.shopify.com/s/files/1/0434/9473/6037/files/tamil_bible_kjv.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/engineering_mathematics_3_vtu_notes.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_off000043c7.bin
91d5843dc357afe2eaa55919fc6aaa6b382b83a0185883be0803f949b59b9f71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43C7 5276 bytes
font_01_sfnt_off000055ce.bin
5e463063cacd095f9a8dfb87df9567b9d25161690f2ae8fdbe7ee0f2f6f8b5c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55CE 9680 bytes

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