Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee632b27371342b…

MALICIOUS

PDF

37.6 KB Created: 2020-08-16 23:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a25055d8d61b6eb844ed16b76cf019ff SHA-1: 2ddcebcfdc8f8ed4c6d9a2a89836edf9051429c0 SHA-256: cee632b27371342b7ab00a4acb3b698af37e2d6eadc16f2415b2de9c57389aec
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to 'rounding decimals worksheet' and includes the malicious URL, suggesting a lure to disguise malicious redirection. The primary attack pattern involves leveraging a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=rounding+decimals+worksheet+6th+grade+pdf
    • http://files.practicalperspectives.com/uploads/1/3/0/8/130873893/a51c674.pdf
    • http://files.moderndaysolution.com/uploads/1/3/2/6/132681634/aaa5f7e6.pdf
    • http://xovatumif.christianlifeupc.com/uploads/1/3/1/4/131453990/8ac4dd26.pdf
    • https://cdn.shopify.com/s/files/1/0436/7518/9401/files/hiren_boot_14._1_iso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jerozex.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3015/files/varidudisaxuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2951/files/montreal_convention.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/personality_vocabulary_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/6894/7616/files/brain_teasers_pictures_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/9548/1750/files/koxodonep.pdf
    • https://cdn.shopify.com/s/files/1/0431/1928/0288/files/99722744034.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8951/files/formation_alternance_informatique_montpellier.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5885/files/puwojapeverawuguger.pdf
    • https://cdn.shopify.com/s/files/1/0440/6503/0309/files/15598557685.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052b4.bin
46cf821530f466c607ca197ab29f4e230103e6b6cb20d1510d2f673fe2ce2f00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52B4 5888 bytes
font_01_sfnt_off000066a6.bin
ae5b30b0d2e5bc005c1409bb78f7016723e5072be8c5ca2b9fc9627e5a563e59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A6 10328 bytes

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