Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b969090603dc5f…

MALICIOUS

PDF

63.3 KB Created: 2020-09-04 02:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6318ce636c8bbceb77166ea1ec54b60c SHA-1: b220bb9b6931a59fc97364f6053dd3a67d077c8f SHA-256: 84b969090603dc5fc8bf19c0393ee89324c3b1c6ab95dc455c2eeb2302ad8ea6
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a 'Colorado republicans voting guide'. This link, 'https://ttraff.club/pify?keyword=colorado+republicans+voting+guide', is likely intended to lead the user to a phishing or malware distribution site. The PDF also hosts a large number of external PDF links, many of which point to benign content, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious.

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.club/pify?keyword=colorado+republicans+voting+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_c8b0655a010c42b2a46c1260181394e7.pdf
    • https://static.usrfiles.com/ugd/5b604d_0db87561de00468a9890122fd03331c5.pdf
    • https://static.usrfiles.com/ugd/2e16aa_f332c95c68ac4ab2beb470004d7f91b6.pdf
    • https://static.usrfiles.com/ugd/764aaa_650d5d8245ee43a982065f6787f4b87e.pdf
    • https://static.usrfiles.com/ugd/ecd213_07bc70b8e50d4ac2a866aec6efcafc3d.pdf
    • https://static.usrfiles.com/ugd/2f07a1_177674b1a52a45b299ae7070b32e0a61.pdf
    • https://static.usrfiles.com/ugd/3ed902_470d9769345c4b20a72549d95e456c1d.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d82c79d688e4fb28c8073b1860b3c42.pdf
    • https://static.usrfiles.com/ugd/98e298_a0c4d8368f20413e806676af5e5b5271.pdf
    • https://static.usrfiles.com/ugd/4cd51e_5cafde5a8b0d4d0d8d94aec2280fa49e.pdf
    • https://static.usrfiles.com/ugd/f35da0_411fa452b97342f993934205a5980835.pdf
    • https://static.usrfiles.com/ugd/e66789_b227052a50664dfa883c09030c4dfaac.pdf
    • https://cdn.shopify.com/s/files/1/0430/2071/4137/files/black_ops_2_apocalypse_map_pack_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/0730/9984/files/sivawugijifoponorugi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0787/files/analysis_of_variance_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/7792/6040/files/18528513607.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009d6d.bin
2ec094d911a6fd83b7f4b775a74be42a553e83045fd99dd70f57473506e9ffc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D6D 5344 bytes
font_01_sfnt_off0000afa1.bin
8bc3d1af1163d8595e87eb1dbcec45a05629325fdddf5631545b64b916abbc82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA1 13600 bytes
font_02_sfnt_off0000da84.bin
f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA84 16144 bytes

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