Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3e3572cc359916…

MALICIOUS

PDF

57.5 KB Created: 2020-09-06 20:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5599f395d0225a00c20ec77b7caf1d4d SHA-1: eec6fab8dfb629f68430813c993af7286172630f SHA-256: 6e3e3572cc359916fc06912ffc9cee1c9d75015a6555be75aad7af4efcda7e14
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. The document body, though partially corrupted, contains text suggesting it is an 'incident report form' and includes the malicious URL. The presence of numerous external PDF links, many pointing to benign content, suggests a link farm or SEO manipulation tactic to obscure the malicious redirector.

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=incident+report+form+qld+example
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e643da_4d6ac693c0c64388a2d9ed92f2f2a6fa.pdf
    • https://static.usrfiles.com/ugd/83e24f_30cd2a99022f4a8eb20c2170fea56080.pdf
    • https://static.usrfiles.com/ugd/b8c837_abe6bba0a8304adcb885ee555a61a8ab.pdf
    • https://static.usrfiles.com/ugd/5438e3_5a585d5af2ab43ab8ed9e3c19ea2b3a1.pdf
    • https://static.usrfiles.com/ugd/1813b3_35a47472413d4985855e8bbb7ab24595.pdf
    • https://cdn.shopify.com/s/files/1/0437/6271/2728/files/boondocks_season_4_all_episodes.pdf
    • https://static.usrfiles.com/ugd/cb4a18_a547b7fc70154d83beb1edd3e99bb96c.pdf
    • https://static.usrfiles.com/ugd/6908d7_8743e9339cbe47c6a692adf8b8549fa2.pdf
    • https://static.usrfiles.com/ugd/dd6616_953c4d5452c844f48a22e9e1dc256697.pdf
    • https://static.usrfiles.com/ugd/ddb60a_84eed528102945eeb3428a1eb4a53f51.pdf
    • https://static.usrfiles.com/ugd/f08e01_05f08a53112447fa8221554cffdd6683.pdf
    • https://static.usrfiles.com/ugd/01bc73_b7202f14ef8c47ceae837b59ebeab7ae.pdf
    • https://static.usrfiles.com/ugd/6f58fb_c5d5d291b85440e7a2f5619942100145.pdf
    • https://static.usrfiles.com/ugd/696117_fb8b25653f6b428a8105f56e53266244.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007957.bin
847ffbb268548e7b1ac291e91d11be57d6ae2e76118368f061ac979a6b4b6b9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7957 11444 bytes
font_01_sfnt_off00009f0c.bin
7ff5ec715616e8794b600311ee934aff1cf99e20b2e2fe23809ab5d1e8aa1d98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F0C 5256 bytes
font_02_sfnt_off0000b0d8.bin
52b26cfa968315796a66fb0b7bb3b4aedcafe650bc761b57045b7c70b58c8731		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D8 11276 bytes

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