Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b02bfda42a1977…

MALICIOUS

PDF

46.6 KB Created: 2020-09-01 00:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dcf6345087f518cd100cdcafee50eee SHA-1: fff5a49adc75b99830b02d8f7b32ea773b1fa8ef SHA-256: c7b02bfda42a19774d11ba7a005622de97d15fdecb13cca6cd7b891c0efb8e4f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to 'static.usrfiles.com', though these appear benign. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to the malicious URL via the embedded link.

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.cc/wix?keyword=attendance+certificate+format+for+college+students+word
    • https://static.usrfiles.c
    • https://static.usrfiles.com/ugd/b8c837_d850670ac11a4000abbfad43d7352e1b.pdf
    • https://static.usrfiles.com/ugd/739437_d3d1cfb4d80e409ab3b69cfc9ce7c69b.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_e878bc0d7a0a462e8c7a0bf49e79afc5.pdf
    • https://static.usrfiles.com/ugd/0c41e7_58ceb1c091094574a4e92ab92572af1a.pdf
    • https://static.usrfiles.com/ugd/b8c837_727369acb38440cc9e82b2393f2d1ed3.pdf
    • https://static.usrfiles.com/ugd/50de67_f3eb8e6130284ef7bbe355ed84df00a3.pdf
    • https://static.usrfiles.com/ugd/6260fe_00f84c3781764196b9a2ecdd14fb3f8a.pdf
    • https://static.usrfiles.com/ugd/10e3af_3dd2f7ae857b46a5b83e8c4daed65caa.pdf
    • https://static.usrfiles.com/ugd/1849a1_6878337a0eb84a4cae7e3dd08b85765c.pdf
    • https://static.usrfiles.com/ugd/b8c837_74ae297ff93b4b328d2d254a0eeb62d5.pdf
    • https://static.usrfiles.com/ugd/625844_650d0eb844f3452786f7256b684b3d2f.pdf
    • https://cdn.shopify.com/s/files/1/0457/0470/8252/files/swap_rows_in_excel_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/ableton_live_9_with_crack.pdf
    • https://cdn.shopify.com/s/files/1/0435/4588/6884/files/lista_exercicios_tabela_periodica.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4198/files/fefozonisiwosokukum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006814.bin
c1e4489d9e5d4d025cf4150f3e68ada47e705db0bc7106fe182dbde5877dc5fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6814 5304 bytes
font_01_sfnt_off00007a0d.bin
16b5e0c53443dc6f42181b5ed0df4735885fa04b39c7f7d1eaa8998394be4767		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0D 10748 bytes
font_02_sfnt_off00009ea8.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EA8 4324 bytes

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