Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c2e17cf438e9da…

MALICIOUS

PDF

68.3 KB Created: 2020-09-07 02:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4096c3e2e0a86aaf35f84a57dcdf7164 SHA-1: 588be87aee853a9ba03d5e4cbf36dd1985abaaa4 SHA-256: 76c2e17cf438e9dab602442af52024588a92560808a8389d458da7e7288cb594
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier also flagged this PDF with high confidence. The embedded link leads to a redirector, suggesting an attempt to lure the user to a malicious site, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the redirector and the presence of numerous links indicate a malicious intent to direct users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=facilitating+learning+child+and+adolescent+development+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5095/0041/files/9873736399.pdf
    • https://cdn.shopify.com/s/files/1/0439/6092/6366/files/75315825821.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1436/files/piano_chord_progression_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/suvolalusuri.pdf
    • https://cdn.shopify.com/s/files/1/0435/2458/7674/files/clevo_p170em_bios_update.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/wuroxipopofedego.pdf
    • https://cdn.shopify.com/s/files/1/0431/5335/9005/files/when_teams_work_best.pdf
    • https://cdn.shopify.com/s/files/1/0434/5702/0056/files/63638626803.pdf
    • https://static.usrfiles.com/ugd/856cea_dad1413ad3c5413e90c58fd527ea5203.pdf
    • https://static.usrfiles.com/ugd/7c41c1_bedd46770f4c4ca092105d6bc19831fc.pdf
    • https://static.usrfiles.com/ugd/11baf9_6e88760714aa4c7f8c04b0f221c00756.pdf
    • https://static.usrfiles.com/ugd/7a13df_642d9a0534a949429c3c674944250b5f.pdf
    • https://static.usrfiles.com/ugd/ec0c41_ad50b3820c1d4988a5b73af42887a7d9.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6845/files/zotesibovazidijujuxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5777/3718/files/werirap.pdf
    • https://cdn.shopify.com/s/files/1/0462/6451/6757/files/44722491305.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3215/files/temumo.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caa9.bin
473d7e3cd8d09e7af3f78e766754c0edcafe3b2e49289a8f986335c5c1e23151		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA9 5584 bytes
font_01_sfnt_off0000dd84.bin
abdfe4540da043f8f7a09d57abd92d1b752cd48d494e911a7aa08ab0e653daef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 11772 bytes

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