Malicious PDF — malware analysis report

Static analysis result for SHA-256 486da19ccc92302b…

MALICIOUS

PDF

49.6 KB Created: 2020-10-29 08:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7288d753d06d39c71edc153e522213ee SHA-1: 21d26df6a119bfa87e9b2a4151cb6b5e2aab4be7 SHA-256: 486da19ccc92302b126c546bd367aa4e414b07895d27da6bf26313214a64ae4f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links pointing to a known malicious redirector, specifically 'https://cctraff.ru/strik?keyword=google+search+story+youtube'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the ML classifier also flagged the document as malicious. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to disguise a malicious link as search result content.

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://cctraff.ru/strik?keyword=google+search+story+youtube In PDF document text
    • https://silemixijotin.weebly.com/uploads/1/3/4/4/134463531/793959.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/9612681.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/1302795.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/pidedapubujiwuzil.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/vamubaz.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/diabolical_sudoku.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/outdoor_life_the_ultimate_survival_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/tesavug.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/penifizokokofiro.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/centimeters_to_inches_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/kiris.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0487/6727/files/apk_ytd_video_downloader.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9707/8427/files/avast_mobile_security_pro_apk_2020_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/arabic_alphabet_to_english.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/92981194960.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8288 5332 bytes
SHA-256: ce171b3fac45d4105927d535ae2cb8de1a9bd2e55d693fc7ad8c3bdb8a7b7433
font_01_sfnt_off000094b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94B5 10776 bytes
SHA-256: 1b7e57ab34bdb60ec7711b17b6cfdb39acb04828e159461bc283b0eaad9def68

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