Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a64af83fffabce…

MALICIOUS

PDF

40.9 KB Created: 2020-09-05 22:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3ccf9463631ef5273c3d252548eac01 SHA-1: 53a3992dbee88b87d44c7628b6ea7a94914a29d4 SHA-256: 71a64af83fffabce8292ea744d61536bcd0a03aab29d328dd6a24f1bd1394b75
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that likely leads to further malicious content. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to other PDFs hosted on Shopify. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which is likely the entry point for the malicious chain.

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.link/wix?keyword=film+benyamin+sueb+tukang+ngibul
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0602/5128/files/le_salaire_du_sniper_fiche_de_lecture.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/noxisuzasudifopuxamavu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4063/5042/files/wabitejedepalonawili.pdf
    • https://cdn.shopify.com/s/files/1/0431/3455/0173/files/bafinowit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nakawefefaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/5281/7832/files/gililomeperasokutar.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7578/files/basic_linux_commands_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1662/files/anabasis_indir.pdf
    • https://cdn.shopify.com/s/files/1/0431/8648/7456/files/94627249669.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/7805676996.pdf
    • https://cdn.shopify.com/s/files/1/0438/8572/3816/files/askep_bronkitis_kronis.pdf
    • https://cdn.shopify.com/s/files/1/0431/1977/1799/files/adobe_captivate_2019_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/2079/6583/files/90594606341.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/excel_spreadsheet_for_macbook.pdf
    • https://cdn.shopify.com/s/files/1/0440/7823/5798/files/2790913506.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7904/files/jibugorivunovanutipuninol.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6232/files/kupexinerevuberotexeke.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_off000061fa.bin
d6aa849fb6de194657855e83034b9aa6f8683fa43d588e7477d35c9cc4882fcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61FA 5172 bytes
font_01_sfnt_off00007392.bin
9903eec2f98dc338b797c1814aebb3bbd9c6548e4427cd291df1561cea20e0d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7392 10240 bytes

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