Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcf41347c31bcaa…

MALICIOUS

PDF

50.9 KB Created: 2020-08-31 02:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e77e5cde48120e5f145ec76e78eee995 SHA-1: 2b9b71a837391b7c9b76e2584082500a7dd3d142 SHA-256: 8bcf41347c31bcaa643a99b98f7829f730a973908be8c56f81e722fa3ed7cdd7
154 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 'https://ttraff.me/wix?keyword=theon+greyjoy+captain%2527+s+daughter+scene'. This indicates the document's primary purpose is to redirect the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent.

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.me/wix?keyword=theon+greyjoy+captain%2527+s+daughter+scene
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53607129813.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/openssl_create_ca_cert.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/40369833757.pdf
    • https://cdn.shopify.com/s/files/1/0437/2224/4264/files/borbaad_movie_all_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6413/files/business_law_cheeseman_9th_edition.pdf
    • https://static.usrfiles.com/ugd/5de1df_4b8562d50e9c451daf7ced925cdab46e.pdf
    • https://static.usrfiles.com/ugd/2f7815_b512354aef8149e8b9180c86dad9a9f6.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_6764da8fa23d41b8b8c2088d0d5be7eb.pdf
    • https://static.usrfiles.com/ugd/40512e_2e74cad6ca514892834e9c53ab67e547.pdf
    • https://static.usrfiles.com/ugd/b8c837_3010b412e38b43359fd62b332d980e0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a1106e07fa74690aa14897735df7630.pdf
    • https://cdn.shopify.com/s/files/1/0428/7804/2275/files/gta_san_andreas_cleo_apk_no_root_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/6181/4172/files/livros_hernandes_dias_lopes.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/ame_liturgical_calendar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/basubaninaf.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/1/0431/4903/3627/files

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b29.bin
d9b6c82e0a56330a5fe6f1266cb8a00f9cf812c09c8b860524d9a98ffacf5d3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B29 5348 bytes
font_01_sfnt_off00008d62.bin
d1c48dc7fdce2bb3ebd2020f42bd40c4c08f28b68b30fa7ff7a36814de798b0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D62 10144 bytes
font_02_sfnt_off0000b002.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB002 4324 bytes

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