Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b837a8381b6fd85…

MALICIOUS

PDF

94.3 KB Created: 2020-09-09 19:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ea35c6b0a98f3ca05b36796f94b58fa SHA-1: 28e5fa438f6057c2a7f9049444162b9b8351cafa SHA-256: 5b837a8381b6fd85f61c50fbcf39cc333a69294519354ff2090ddd447ff0917c
194 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of a link farm and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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
  • 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.cc/wix?keyword=mario+vargas+llosa+biografia+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/12dc78_9c4c2ad1f0114be9b59032991dae62dd.pdf
    • https://static.usrfiles.com/ugd/0f9ef0_2eb874ae55314f54a73918d79612592a.pdf
    • https://static.usrfiles.com/ugd/10e3af_93b20de8d26041569e0e33ad52594740.pdf
    • https://static.usrfiles.com/ugd/b8c837_efc3a2a58ac94b36bb8b3bdd4e5be681.pdf
    • https://static.usrfiles.com/ugd/df4650_2b1e89b9a7ce42dda6c53b8e8d339597.pdf
    • https://static.usrfiles.com/ugd/3b7182_cfab750d7c804c89b3bf961dc00acb93.pdf
    • https://static.usrfiles.com/ugd/18f527_fb77d1f8129748d19e8a3c30d098fa73.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_7215a748271448c8a96ae41a5ab28c3c.pdf
    • https://cdn.shopify.com/s/files/1/0464/0912/1960/files/beginner_strength_training_program.pdf
    • https://cdn.shopify.com/s/files/1/0439/5106/3195/files/auditing_and_assurance_services_international_edition.pdf
    • https://static.usrfiles.com/ugd/1ebe14_be2754baa4e646609c2fb25964f17529.pdf
    • https://static.usrfiles.com/ugd/7a359d_db57de1efb884f2d8922c768b2170392.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_off00012e72.bin
f375d0c82ea1a716a7f9b3f2f044b6dbeddfd36fc385fbdd6aa1ee83c18527a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E72 5416 bytes
font_01_sfnt_off000140fd.bin
a47fb5b2bbfe47b9c4563da54314b6fbc53a9c5bd1841f6a7ee51201f3c6597b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140FD 12840 bytes

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