Malicious PDF — malware analysis report

Static analysis result for SHA-256 635e4747a8059998…

MALICIOUS

PDF

55.5 KB Created: 2020-08-12 16:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f468a73e8b91215ef19a534a4f70fd1 SHA-1: 3112c13ba711e9cac04a0e9bb7146b7a6218c8d9 SHA-256: 635e4747a8059998301e328d09ecc3869a0d9a40baea0d83f18e8a194a886d44
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=revolta+da+cabanagem+pdf`. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection.

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/pify?keyword=revolta+da+cabanagem+pdf
    • http://nuvekowa.juliansmith.com/uploads/1/3/2/6/132680813/furupugowal.pdf
    • http://zuwamofa.goethefruehlingsfest.com/uploads/1/3/2/7/132712615/3408824.pdf
    • http://files.grhsnhs.com/uploads/1/3/2/6/132682076/vorigakata-lebetaluwex-zefopamo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/85680325842.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lajuvifubukakevo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0280/5921/files/80335465284.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/70677678366.pdf
    • https://cdn.shopify.com/s/files/1/0434/0776/9750/files/53128199060.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/warokaramukifovugulima.pdf
    • https://cdn.shopify.com/s/files/1/0431/7619/8305/files/cara_membuat_surat_lamaran_file.pdf
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/41504077249.pdf
    • https://cdn.shopify.com/s/files/1/0432/0428/0481/files/water_supply_and_sanitary_engineering_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9377/7827/files/vepiwemowu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1018/5637/files/english_grammar_articles_in_gujarati.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_off0000852b.bin
0cfc591ad77d5e6dac3358f9694768f6fb95836b8cac5f4a5dc45f751c778c9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x852B 5408 bytes
font_01_sfnt_off00009793.bin
b91ad503e47c0a9e82548d3d481eece5e82cde3b305eea8deb317f2a192fa0fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9793 10628 bytes
font_02_sfnt_off0000bbd7.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD7 16204 bytes

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