Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e38d0c3b6cbb8d…

MALICIOUS

PDF

49.9 KB Created: 2020-08-23 04:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43a000bb107b61b3ea9d709421256701 SHA-1: 245c63abf28ac3f2d4d6d8882583b6bc52f415f3 SHA-256: f3e38d0c3b6cbb8df31f19a459d58ef80142b1bb8db92fa16fb4a3e5dd81ee37
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. The document body, though heavily obfuscated, contains text related to TOEFL preparation and a URL that redirects to a malicious domain. This suggests a phishing or scam attempt to lure users to malicious infrastructure.

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/pify?keyword=toefl+ibt+integrated+writing+topics+with+answers
    • http://files.premierpropertysvc.com/uploads/1/3/1/6/131636954/webapak.pdf
    • http://files.akashachamberlain.com/uploads/1/3/1/4/131437885/tunupesa.pdf
    • http://sujov.bestsoundonly.com/uploads/1/3/0/7/130775934/figebebafilobereraxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8551/files/chatwal_book_of_inorganic_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0440/6499/7526/files/21075507065.pdf
    • https://cdn.shopify.com/s/files/1/0447/2812/3545/files/caller_id_app_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/1015/4908/files/77951463943.pdf
    • https://cdn.shopify.com/s/files/1/0428/2132/0870/files/chromecast_extension_chrome_android.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/84217414578.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/11428469570.pdf
    • https://cdn.shopify.com/s/files/1/0432/2351/5294/files/sample_answers_to_interview_questions_for_nurses.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5351/files/37224685041.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/
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/114

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000849b.bin
b0dfa88ef8abdcfd22e28487f820a19761150e4d27ffbb817ddee5471162ad18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x849B 5600 bytes
font_01_sfnt_off000097a9.bin
de8f954b8c9f8e535c5e03a5680ab856aa22255472f6095eba86f5c61b994741		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97A9 10236 bytes

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