Malicious PDF — malware analysis report

Static analysis result for SHA-256 632578376b9c141a…

MALICIOUS

PDF

53.0 KB Created: 2020-08-22 18:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3c9c72115ab8570869d3972a43c698a SHA-1: 3acabcc09dc9ac99bacd3098f912dbda4e0e5bb6 SHA-256: 632578376b9c141a9faa171381e56935998f881cf62d58ff03350a69641bf404
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at 'https://ttraff.cc/pify?keyword=caries+dental+pdf+2018'. The document body, though heavily obfuscated, contains text related to 'caries dental pdf 2018', suggesting a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=caries+dental+pdf+2018
    • http://files.odgs.net/uploads/1/3/0/8/130814052/2bd6bbfedb1.pdf
    • http://files.greenrootsgourmet.com/uploads/1/3/2/7/132712093/pisixuwojex_guxiku_puxexumub.pdf
    • http://mokipo.contractorsinmalibu.com/uploads/1/3/1/0/131071057/lebabutum.pdf
    • http://negereba.rsconcerts.org/uploads/1/3/2/8/132814337/4cbae3a9d.pdf
    • http://files.zhuomengting.com/uploads/1/3/1/4/131406390/siniresizulanul_ruxixiwaduzun_kesogasi_wunoxadax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0451/0887/files/avatar_jar_games.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/volaroridiku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.pdf
    • https://cdn.shopify.com/s/files/1/0431/5719/2865/files/logitech_master_mx_2s.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/44787876084.pdf
    • https://cdn.shopify.com/s/files/1/0432/8960/8360/files/scdl_soundcloud_er_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8912/files/zuvejonefojoxajal.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/c_programming_language_algorithm.pdf
    • https://cdn.shopify.com/s/files/1/0433/7179/0486/files/accounting_excel_skills.pdf
    • https://cdn.shopify.com/s/files/1/0434/7445/2632/files/jodipejujubevezo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0996/5212/files/act_sample_tests.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_off0000886f.bin
2ff8e661f76b074c23ff5ce9f203a5c7e906995579fada158857dcc096c1ec12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x886F 5460 bytes
font_01_sfnt_off00009b0d.bin
476a90ca15b12436b9bd1a14186b03288957693c6a3b30487eb7cd927a7bd10b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B0D 13932 bytes

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