Malicious PDF — malware analysis report

Static analysis result for SHA-256 75187f4b0fc7fb3d…

MALICIOUS

PDF

50.5 KB Created: 2020-09-17 10:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23af0c68def0464471213d6784394f23 SHA-1: 3076e60f8b051b09f3616fc110d205b88e2454dd SHA-256: 75187f4b0fc7fb3d26ef21949ed290be02fab3b8ea37b0eb820c49e6d93d3e50
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various platforms. One prominent link, 'https://ttraff.me/wix?keyword=area+of+trapezium+worksheet+class+8', is identified as a malicious redirector. The document's structure suggests it is part of a link farm designed to distribute traffic to potentially malicious sites, masquerading as educational content.

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.me/wix?keyword=area+of+trapezium+worksheet+class+8
    • http://files.movetoamendpdx.org/uploads/1/3/1/8/131857140/3969869.pdf
    • http://files.eatwatchgo.com/uploads/1/3/1/4/131413148/xigorokaxe-lewasovari.pdf
    • http://files.tilicho.fr/uploads/1/3/2/6/132681763/nikujevosuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xorufolikuvuzinekotawoxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9426/8320/files/fesukofasimaze.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/alter_ego_plus_b1_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0433/8784/6806/files/61780908009.pdf
    • https://3d4160c6-00a9-4766-95ed-895f92264bbc.filesusr.com/ugd/5de1df_847bd5a7b9ba4c44987353f54c8178f6.pdf?index=true
    • https://4c1c5d33-d5c5-4e71-8300-6b8feb42dba5.filesusr.com/ugd/bcb9fd_318e63ce917041d392ea3845c7e38000.pdf?index=true
    • https://12bfd732-7687-4955-9476-ad647f841298.filesusr.com/ugd/dec231_ec35c81168ad4fb194681389d1a01238.pdf?index=true
    • https://f9ad431b-d0bc-41a4-9534-df98e13e52b9.filesusr.com/ugd/501a20_a13a346c83ed4b48a8cb8a99ce0cdb27.pdf?index=true
    • https://14c72064-8bb9-48be-8bbd-936e2405a338.filesusr.com/ugd/aff7ca_6b3ad3ccb7c7453298db97efb8950fa9.pdf?index=true
    • https://a602dd6a-dff1-4289-b341-eab35cd2b447.filesusr.com/ugd/d7ba0f_cf79c0c3f5814e7fa6cca3198cbd57cd.pdf?index=true
    • https://84d1550a-255b-4d30-b1cf-c174426c7e55.filesusr.com/ugd/696117_52ec98439a204ea9a5d88654fcc2da20.pdf?index=true
    • 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_off00006ab6.bin
71de319fc465b46ed0ecb67b3fbe73ef1ba452e88140405a3797842d438fc50d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB6 5644 bytes
font_01_sfnt_off00007de2.bin
86db73da81b23ad8ff64e2b0e051e9b887bb050c200fda5d2196d6558ac870b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE2 13240 bytes
font_02_sfnt_off0000a80f.bin
ccd0ea095085b9379100d4de0d13d045157d8501f46cd3db2ef5c00475687e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA80F 16088 bytes

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