Malicious PDF — malware analysis report

Static analysis result for SHA-256 1393ded2488c0e63…

MALICIOUS

PDF

42.5 KB Created: 2020-07-09 06:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18233d65a4985010f94c95ecd28faf9d SHA-1: dce9e00ecc52be8369dd07c1c33cc76201d0159d SHA-256: 1393ded2488c0e63109018cdc26dafef1bd4a0787460133fa565dc2c92b38826
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection scheme. One prominent link, 'https://ttraff.com/wb?keyword=cucaracha%20periplaneta%20americana%20pdf', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links and the malicious redirector indicate an attempt to drive traffic to potentially harmful sites.

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.com/wb?keyword=cucaracha%20periplaneta%20americana%20pdf
    • http://files.nftebayarea.org/uploads/1/3/2/3/132303378/wibopejaf.pdf
    • http://files.friendshcls.org/uploads/1/3/1/8/131871467/6a03116cf28c.pdf
    • http://files.arlingtonmsband.com/uploads/1/3/1/6/131606087/ddee7.pdf
    • http://files.mollygaston.com/uploads/1/3/0/7/130738845/luras-muruviparewe-piwujor-bilaxew.pdf
    • http://files.stanthonyschoolsg.org/uploads/1/3/0/7/130739419/cd9140f865.pdf
    • http://files.telaadvisor.com/uploads/1/3/1/3/131381411/jinoxa.pdf
    • http://files.insightsandilluminations.com/uploads/1/3/1/4/131453045/485ba9ebd953.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://laderowo.files.wordpress.com/2020/07/dopexuzigejufi.pdf
    • https://dirubupu.files.wordpress.com/2020/07/86513971557.pdf
    • https://gijafodopaw.files.wordpress.com/2020/07/56806842249.pdf
    • https://zijumaxiwigu.files.wordpress.com/2020/07/kajuwipajomaxokuzefevazu.pdf
    • https://zufarosivalu.files.wordpress.com/2020/06/7693476273.pdf
    • https://todufedok.files.wordpress.com/2020/06/20952128694.pdf
    • https://ripituwuwi.files.wordpress.com/2020/07/90574251061.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baxumedufimoval.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xidab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dedijadexurusefux.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_off00006610.bin
b340897db7a7fbdbc0a9dd47b70d15ce4ed45e73394cae41058fb2e55b210455		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6610 5012 bytes
font_01_sfnt_off000076ec.bin
a7c2ad6dda530e2ee06a688a477d110b085c8dd79ea971c9d3f998abaed5ee24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76EC 11136 bytes

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