Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ddd19e6cc414ce…

MALICIOUS

PDF

40.2 KB Created: 2020-10-04 17:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4daaed967ea75bc1b1032182a7a56777 SHA-1: 7482823ab88de5763640443c438c426c27e9d2a3 SHA-256: b2ddd19e6cc414cefcd7858acddf6bb4fc026aa073a2ffdece826cc0d069d3e4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files, indicating a link farm designed to manipulate search engine results or redirect users. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/pify?keyword=finding+volume+and+surface+area+of+a+cylinder+worksheet In PDF document text
    • http://files.fkelmusic.com/uploads/1/3/0/8/130873802/nodexevewiwenux.pdfIn PDF document text
    • http://files.meghancaprez.com/uploads/1/3/0/8/130814553/1728256.pdfIn PDF document text
    • http://files.graphicdesignyork.com/uploads/1/3/1/4/131410939/zozijadij.pdfIn PDF document text
    • https://site-1037082.mozfiles.com/files/1037082/tujotipo.pdfIn PDF document text
    • https://site-1038402.mozfiles.com/files/1038402/ferosubulagunodugiraro.pdfIn PDF document text
    • https://site-1042429.mozfiles.com/files/1042429/xegezejodila.pdfIn PDF document text
    • https://site-1038493.mozfiles.com/files/1038493/dovugodat.pdfIn PDF document text
    • https://site-1036661.mozfiles.com/files/1036661/pilubora.pdfIn PDF document text
    • http://files.kesslerkarateacademy.com/uploads/1/3/0/8/130874529/e03792c839.pdfIn PDF document text
    • http://lasuxuz.pros2gogolf.com/uploads/1/3/2/6/132681670/dibunuzoru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7151/8373/files/convert_1.6_fl_oz_to_mls.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/1163/8949/files/sparco_racing_seats_red.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2857/4119/files/77114553884.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7247/4273/files/61884106356.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2562/9335/files/75040008460.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_off00005db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB5 5708 bytes
SHA-256: a996f4c9b91156204acd0f82de7d070cd3089faac8e995971de32659bd0f7aca
font_01_sfnt_off00007116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7116 10232 bytes
SHA-256: 72acaf524fae52319f3a44538455f37a10ad69f8893e2ceb4895d5fa3edcfc72

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