Malicious PDF — malware analysis report

Static analysis result for SHA-256 961e13e12872bde9…

MALICIOUS

PDF

33.7 KB Created: 2020-08-30 06:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed5ce6ab56456e3815008e9bd3c67f73 SHA-1: e8bdf3bc4957e97e10d5cc50d9ca6276bd5d181e SHA-256: 961e13e12872bde9e442a32e1d40161b030765965053605b9a2d56bebc47493f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing indicating a malicious redirector link. The document body, though partially garbled, includes text that appears to be a lure related to 'free access code'. The primary malicious IOC is the URL 'https://ttraff.com/wix?keyword=myelt+c%25C3%25B3digo+de+acceso+libre', which is flagged as a malicious redirector. This suggests the document's purpose is to redirect the user to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=myelt+c%25C3%25B3digo+de+acceso+libre
    • https://static.usrfiles.com/ugd/b8c837_84925f555f054e87bcf7bacf60537fb1.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe9d8082320a4ceab11390cfd2e64385.pdf
    • https://static.usrfiles.com/ugd/cac9e4_26153155f939490aa9cc23149ebebef7.pdf
    • https://static.usrfiles.com/ugd/0df15e_899c3c6235384942991843700e9e906c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b045058898184f6b8774cabba4cb35ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b8f1a4400a3422b8909dc1a4f0ee5ce.pdf
    • https://static.usrfiles.com/ugd/77d535_cf92c7c0e2844d8988b74579f18392a8.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/aoac_analytical_methods.pdf
    • https://cdn.shopify.com/s/files/1/0437/7952/2722/files/editing_text_online.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004247.bin
9b713abf99fdcf78e2b5d215c50d5abc5d8961b7579730842017ff71e871ccc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4247 5492 bytes
font_01_sfnt_off000054c9.bin
be8fe32ed45d5d5f217ffad855ad1f6f7c3010720e131aa3dcb192164b5c9c21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54C9 11084 bytes

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