Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c152d44b4d4c4c4…

MALICIOUS

PDF

64.4 KB Created: 2020-08-11 14:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fb5bcf81789edb969a7225f4b8b9ae0 SHA-1: 2f234fdfadfd5269199ca3683164d5f9b9851416 SHA-256: 0c152d44b4d4c4c4c9a578994d01e0541664400ea6c3437dee164e7c54da4447
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. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract users searching for specific content. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful 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.ru/pify?keyword=sjkc+year+4+english+textbook+pdf
    • http://files.creativefinishesstudio.com/uploads/1/3/1/0/131071114/lalenubogida.pdf
    • http://zojej.coach102.com/uploads/1/3/1/6/131636725/jewofoz-vasogumu-kofuse.pdf
    • http://files.sterlingne.com/uploads/1/3/1/6/131637056/wotakitis.pdf
    • http://files.brooklynondemand.com/uploads/1/3/0/7/130739204/2511294.pdf
    • http://files.lakehouselures.com/uploads/1/3/1/3/131382955/wukopet-zefujesemep-gepawumuk-xabotitoves.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2057/3080/files/balboa_hot_tub_codes.pdf
    • https://cdn.shopify.com/s/files/1/0435/9992/1315/files/fazugowexabaresageropuxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/7716/3426/files/waxomisosaxan.pdf
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/free_download_math_worksheets_for_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/diccionario_de_armando_hoyos.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5592/files/70716736208.pdf
    • https://cdn.shopify.com/s/files/1/0437/5350/4917/files/etodolac_400_mg_tablet.pdf
    • https://cdn.shopify.com/s/files/1/0430/2857/8467/files/business_management_skills_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1945/files/nezijugukagoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/que_es_metabolismo_anabolismo_y_catabolismo.pdf
    • https://cdn.shopify.com/s/files/1/0440/5559/3110/files/limozumofimumel.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fe8.bin
bda9a35608dcbdcf1f53752c46c59d471f73a22874e0ba49df3b700b630a6f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE8 16632 bytes
font_01_sfnt_off0000a4b4.bin
7a89f4ce1f72d0ffa5f734101c0ba05956087670ebd935461af48b952ec8a1f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4B4 6060 bytes
font_02_sfnt_off0000b954.bin
92f5c9e70fc10afce00cb39171de81ca4442423822e75a30a6f839d52ebd8133		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB954 10356 bytes
font_03_sfnt_off0000dce0.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 16092 bytes

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