Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99e4b17e0bd4028…

MALICIOUS

PDF

36.8 KB Created: 2020-08-11 12:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19b8e62bc836266f244703f4d5a066d1 SHA-1: a60ccff4e22542fa10cd8256233e9f64212473c3 SHA-256: c99e4b17e0bd402852339f8db9103eb3671d7d8544b9fe16aa6a1abbc7309961
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract users searching for academic materials. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of links to known malicious infrastructure.

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=advanced+calculus+pdf+notes
    • http://fusudomuf.clarioncountyato.org/uploads/1/3/2/6/132681670/xowululorero.pdf
    • http://munevof.life-preserver.com/uploads/1/3/1/6/131637136/pojaponi-lojosikeju-vunosukufa.pdf
    • http://files.winningtimefarm.com/uploads/1/3/1/6/131636807/wekelozoxujopu-gavofidujovaf-gakulujiweka.pdf
    • http://rolep.anuncommonplace.com/uploads/1/3/0/7/130775164/nuzobef.pdf
    • http://files.metroweather.com/uploads/1/3/2/6/132682829/witus.pdf
    • https://cdn.shopify.com/s/files/1/0433/9564/5589/files/53708212829.pdf
    • https://cdn.shopify.com/s/files/1/0434/5551/2738/files/86329278146.pdf
    • https://cdn.shopify.com/s/files/1/0436/1935/2740/files/busqueda_de_informacion_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0429/2070/6204/files/41449737914.pdf
    • https://cdn.shopify.com/s/files/1/0430/4830/4797/files/fejopemolokufofabalejupo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3042/files/64560404140.pdf
    • https://cdn.shopify.com/s/files/1/0437/4075/8170/files/binomio_al_cubo_ejercicios_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/2998/files/zogebudeno.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zigomotixiwututorevibalu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0908/0477/files/95531761203.pdf
    • https://cdn.shopify.com/s/files/1/0434/5046/6471/files/sonegav.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004750.bin
7bcb2485b22d6f1446fe588515a641369e3bc049655784fc25fac7ff91f3819e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4750 4936 bytes
font_01_sfnt_off00005833.bin
643a0a4669a7dff0e0fd5e9b2cbccbd96dfd046b8822bc0e3f36fbb3d6eff2aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5833 9440 bytes
font_02_sfnt_off00007842.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7842 4324 bytes

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