Malicious PDF — malware analysis report

Static analysis result for SHA-256 886fad61b3e99228…

MALICIOUS

PDF

52.8 KB Created: 2020-08-10 03:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f1c4547e989428ecd91f20338a09604 SHA-1: 614c0159263e481302937659dbf2044d683bfb92 SHA-256: 886fad61b3e9922860de07e24ab2f8b85114373269b4fcf0d00db928cf5dade1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning attempt. One critical heuristic firing indicates the PDF links to known malicious redirector infrastructure via the URL https://ttraff.com/pify?keyword=biotecnologia+tradicional+y+moderna+pdf. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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.com/pify?keyword=biotecnologia+tradicional+y+moderna+pdf
    • http://files.msbanach.com/uploads/1/3/1/0/131070846/zemokikidinow.pdf
    • http://files.rmscnc.com/uploads/1/3/1/4/131453432/konozifiwuwugok.pdf
    • http://files.drinkgreatteamarketplace.com/uploads/1/3/2/6/132681812/4642595.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59577082877.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/9867410632.pdf
    • https://cdn.shopify.com/s/files/1/0437/5825/6286/files/70437721501.pdf
    • https://cdn.shopify.com/s/files/1/0434/2477/6354/files/senop.pdf
    • https://cdn.shopify.com/s/files/1/0441/3505/5512/files/89253238105.pdf
    • https://cdn.shopify.com/s/files/1/0437/6359/7466/files/nimepimabajesupojiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7095/files/79706814468.pdf
    • https://cdn.shopify.com/s/files/1/0438/3493/3398/files/wujubuvebebex.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7894/files/rilunozinesegotudetebuju.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1126/files/42971976692.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/vaxevumanumov.pdf
    • https://cdn.shopify.com/s/files/1/0441/0766/1464/files/variable_independiente_y_dependiente.pdf
    • https://cdn.shopify.com/s/files/1/0428/6418/1404/files/aptitude_questions_and_answers_for_engineering_students_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/17262130506.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ccd.bin
8b1d91de4a441a00f0ed276ec0455ae04ca18480fc091b32b50f20441cc5962a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCD 5448 bytes
font_01_sfnt_off00009f4c.bin
6e30048ff3d7c7d1618114164dcdc84c7a0fef118213d4d89d9d272b35db6520		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F4C 11356 bytes

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