Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dad78f28d80595d…

MALICIOUS

PDF

45.2 KB Created: 2020-08-30 20:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a44afeee3954fb9ff4b4486b8353979 SHA-1: aba79c3bd2e6b6042026fc0955e5f4ea37cb9eec SHA-256: 6dad78f28d80595d7d72b68612ccdde43ace523f4ce42d7bd26acc22caff2f49
242 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by a high-confidence ML classification. The document also instructs users to disable security software and mentions a password-protected archive, indicating an attempt to deliver a malicious payload. The presence of embedded URLs and the nature of the heuristics suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.me/wix?keyword=popcap+games+download+zip
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8916/4440/files/mannix_theme_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3925/files/dabavumujipilogovexexuf.pdf
    • https://cdn.shopify.com/s/files/1/0462/6006/0314/files/surprised_by_joy_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0762/2817/files/38880834477.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2628/files/time_value_of_money_concept.pdf
    • https://cdn.shopify.com/s/files/1/0434/2215/4908/files/70339026570.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/32879743416.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/4658476069.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/95564128260.pdf
    • https://cdn.shopify.com/s/files/1/0433/8063/7859/files/pagopuxegibubevu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0884/2152/files/13888773993.pdf
    • https://cdn.shopify.com/s/files/1/0431/4012/0733/files/basizoxovolatowasurolab.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/matter_and_interactions_3rd_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/5038/2998/files/gejaxapexik.pdf
    • http://www.popcap.com/Not
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058d3.bin
f3646084b18f7a556c631683df71ca07fba8d3b9d03a469cc6a0f0c3e5cd59cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D3 5440 bytes
font_01_sfnt_off00006b56.bin
4c8ca6788ed7bbb37a80dfc309a94f9f0cb7cced01f648ff98160afd011c98eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B56 10888 bytes
font_02_sfnt_off000090b0.bin
2d156610547c6b02f33be9b60b2ccc2c35e689ae01f73c0cb1a51f977a4fd472		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90B0 16744 bytes

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