Malicious PDF — malware analysis report

Static analysis result for SHA-256 909c29ed28943f83…

MALICIOUS

PDF

35.5 KB Created: 2020-08-27 16:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9336285e488b1eabb05e2291afd8d9ea SHA-1: 148a00bd13dd0d284f081e423dda21e0b086603e SHA-256: 909c29ed28943f832b3b3720f6bf31d217c83370d2415b6d4be949a5fd3a1cf8
120 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Easy grader with half points' and the malicious URL, suggesting a lure to a phishing or malware distribution site. No scripts were extracted, but the presence of a malicious redirector link is a strong indicator of malicious intent.

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.link/pify?keyword=easy+grader+with+half+points
    • http://files.losaltosneighbors.com/uploads/1/3/1/1/131163617/salopufitoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/csgo_launch_options.pdf
    • https://cdn.shopify.com/s/files/1/0428/5598/9404/files/american_movies_free_for_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0435/7108/5475/files/brainstorming_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0440/8085/7253/files/rugenetizejipifanezuweri.pdf
    • https://cdn.shopify.com/s/files/1/0439/5014/5704/files/belkin_n300_extender_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/4160/3239/files/aptitude_test_questions_and_answers_with_solutions_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7063/files/9880300957.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/xodojedututazilomawunonef.pdf
    • https://cdn.shopify.com/s/files/1/0434/6282/0005/files/sql_queries_interview_questions_for_testers.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/83816771719.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/jiralurefojod.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_off00004e1f.bin
82b98b3ded786eec9f82c472c1544e4b25ce0289f326115c1c07bffb69a850f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E1F 5452 bytes
font_01_sfnt_off000060bc.bin
bd2e9a8f32bea24e10dfced4b9402782ab16a2caf34761fc738d927ad1681c57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60BC 9608 bytes

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