Malicious PDF — malware analysis report

Static analysis result for SHA-256 662e70598b135879…

MALICIOUS

PDF

43.6 KB Created: 2020-08-30 02:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fe1a899c8189c7f4ea4d5818207f166 SHA-1: c61991b82d3320d48071d3539948d09a6452d8b4 SHA-256: 662e70598b1358798d6f62ba3397f7acb6367e297a5d9dbc09213039fae6fe16
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=character+development+worksheet+readwritethink'. The document body, though heavily obfuscated, contains text suggesting a 'character development worksheet' lure. The presence of multiple Shopify links, while mostly benign, contributes to a link farm tactic. The ML classifier strongly indicates 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.com/wix?keyword=character+development+worksheet+readwritethink
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/4713/1035/files/56747752878.pdf
    • https://cdn.shopify.com/s/files/1/0433/3423/8362/files/telunuzodejeramuxa.pdf
    • https://cdn.shopify.com/s/files/1/0439/9867/5102/files/file_ko_cho_copy.pdf
    • https://cdn.shopify.com/s/files/1/0432/3229/7124/files/legacy_of_discord_vip_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0949/8536/files/nefefiraxi.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc46a0b16e4346c4a18725da75f39a3d.pdf
    • https://static.usrfiles.com/ugd/b8c837_1047222140094212abc2e0fb59586faf.pdf
    • https://static.usrfiles.com/ugd/5b9a87_660955bd66234369884c3047a1d7efe9.pdf
    • https://static.usrfiles.com/ugd/ae15ca_a1ff258f58564cd3abc5f4e74a243216.pdf
    • https://static.usrfiles.com/ugd/26938b_f48d10513b1d4ceeafaf0da85021f689.pdf
    • https://static.usrfiles.com/ugd/b8c837_66738736f2ad4c5b98e62a0b1133a496.pdf
    • https://static.usrfiles.com/ugd/b8c837_3350e7732eff4e7ebd18d9e202cbc4ba.pdf
    • https://static.usrfiles.com/ugd/565485_9684a6301dd04dd38acd83064f453ee1.pdf
    • https://static.usrfiles.com/ugd/f55bec_c3c1f75247e4402391941791a386679e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b7039da0d7347e782c7dc53500da723.pdf
    • http://www.readwritethink.org/classroom-resources/lesson-plans/action-character-exploring-character-
    • 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_off00006c24.bin
93b4047abe9f57a08b071aa8a0f0867e99a9e9abfc0f183ebc135d497aacd8ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C24 5432 bytes
font_01_sfnt_off00007e8a.bin
3f2f0a699bc67f121a19b269db2c9547d5bda77526e4c5db84dbd5a5dfd67b45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E8A 10312 bytes

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