Malicious PDF — malware analysis report

Static analysis result for SHA-256 1652c4be04ee4e2c…

MALICIOUS

PDF

41.4 KB Created: 2020-08-05 10:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92e1cd48663ce78aa56b7b20911e9b67 SHA-1: 76f75786af61554dc7e47c5dde8eb60ff1acf2b4 SHA-256: 1652c4be04ee4e2cc53c755c24fa0cbcfcbe1489749fc4c12c3c1975ebccc226
154 Risk Score

Malware Insights

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

This PDF file 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 a lure for educational materials, likely intended to trick users into clicking the malicious links. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed for SEO manipulation to distribute malware.

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=benim+hocam+co%25C4%259Frafya+soru+bankas%25C4%25B1+pdf
    • http://puneja.eastbaymf.org/uploads/1/3/0/7/130775387/jigapimuzumuvevosif.pdf
    • http://files.reishorerealty.com/uploads/1/3/1/4/131483153/rarumadakapojib_wupipobexe_zidemavifijo.pdf
    • http://gorosoku.wildflowermoonfarm.com/uploads/1/3/2/7/132740892/4206459.pdf
    • http://files.lilogisticscenter.com/uploads/1/3/1/6/131606135/pidet_kedef_ralofa.pdf
    • http://files.fishnfrolics.com/uploads/1/3/2/8/132814906/fee1095655.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2583/3882/files/26902659691.pdf
    • https://cdn.shopify.com/s/files/1/0429/8548/8543/files/10984605925.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53262414385.pdf
    • https://cdn.shopify.com/s/files/1/0428/7194/7423/files/strength_of_materials_objective_questions_and_answers_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6124/files/2056377211.pdf
    • https://cdn.shopify.com/s/files/1/0434/7019/2802/files/mibutuserudadodudiw.pdf
    • https://cdn.shopify.com/s/files/1/0439/1819/6891/files/elements_of_electrical_engineering_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/36493712400.pdf
    • https://cdn.shopify.com/s/files/1/0434/3136/2725/files/pevorakafanaxoko.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/xixewilewonitola.pdf
    • https://cdn.shopify.com/s/files/1/0433/3876/0342/files/tasovatutidun.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/34662310213.pdf
    • https://cdn.shopify.com/s/files/1/0431/3543/4901/files/42123583019.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000547d.bin
2b8cbd52103c0ed54032f98134a5fd8b21c5b37cf89cbf82c50f55a40866ba2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x547D 5980 bytes
font_01_sfnt_off000068b3.bin
cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B3 1936 bytes
font_02_sfnt_off000071f2.bin
5964f013fa97492ed25d8f34695e42ad5ddc39ec591f7213a1092b5ff5a50eff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F2 11644 bytes

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