Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbfbe1791a27a9f…

MALICIOUS

PDF

41.0 KB Created: 2020-09-02 01:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43d7269dffbb7bbcaf3dd2fd8aab891f SHA-1: a741d359b59fd2381db9a3b0e1a8d606f1ace086 SHA-256: 5cbfbe1791a27a9fabee7cb0aa9e1bcfc51d8f9b2155a4ea0346e6a18946a5c9
162 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=blood+circulation+in+the+heart+worksheet', suggesting a lure to a malicious site disguised as an educational worksheet. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, further supporting a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/wix?keyword=blood+circulation+in+the+heart+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/696117_d2d9b44c76ef4c8d81e5d26da091a47b.pdf
    • https://static.usrfiles.com/ugd/b8c837_382e334395aa4a4f8bcb044adaced5c0.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_e5c9d9f13aee46309c8d4bbce4cb0f9d.pdf
    • https://static.usrfiles.com/ugd/06497e_a79760037b1949439e50f92d9ab8d630.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0938/files/10889148057.pdf
    • https://cdn.shopify.com/s/files/1/0432/3626/2052/files/algorithme_cours_exercices_corrigs.pdf
    • https://cdn.shopify.com/s/files/1/0447/8897/3729/files/hazardous_waste_management_download.pdf
    • https://static.usrfiles.com/ugd/2ac701_7d5603b7b23b47fe97bf3167e45df835.pdf
    • https://static.usrfiles.com/ugd/8b9728_b4cfc7fa394e4c8dad798a243821760e.pdf
    • https://static.usrfiles.com/ugd/9219f8_5712a03c07c24138bec770a5bcb561c0.pdf
    • https://static.usrfiles.com/ugd/5cd33b_27cb6cb8c9ca4e8cb6d34c2eae182f15.pdf
    • https://static.usrfiles.com/ugd/837d34_ccb83914eed24f4fb648d2ff5477bfe0.pdf
    • https://cdn.shopify.com/s/files/1/0440/9350/5688/files/subnautica_base_building_tips.pdf
    • https://cdn.shopify.com/s/files/1/0429/9712/1178/files/rare_pokemon_sun_qr_codes.pdf
    • https://cdn.shopify.com/s/files/1/0438/4843/3829/files/50555147166.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4986/files/google_play_store_for_pc_direct.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_off0000609a.bin
8b882868bf13130138bba1857db5b42338f11a51d8624ba09871a1ab72fc22b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x609A 5232 bytes
font_01_sfnt_off00007271.bin
792da543624323278ab2f15b60a7d76a414fb861f870d695447427f753106034		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7271 10884 bytes

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