Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddcd869c5c93ca9…

MALICIOUS

PDF

58.3 KB Created: 2020-09-17 02:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9fff1b063a5f50d95c24a14a1f39e15 SHA-1: 08f69dbdb04b53801b61daaa0a4f0823321a2f83 SHA-256: dddcd869c5c93ca9191812a1daad27c81ce48ae726e4d0ecae949510d3232292
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.club) or host PDF files. The heuristic PDF_SEO_LINK_FARM indicates a link farm, and PDF_MALICIOUS_REDIRECTOR_LINK confirms a link to known malicious infrastructure. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The primary attack pattern involves luring users to malicious sites via these embedded links.

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.club/wix?keyword=tokimeki+memorial+girl%2527s+side+3rd+story+clothing
    • http://musovive.heatherskowoodjewelry.com/uploads/1/3/1/0/131070152/e0407.pdf
    • http://files.shearserenitysalon.com/uploads/1/3/1/3/131383553/53b9878d6b0f11.pdf
    • http://files.servicesveterinairesambulatoireequin.com/uploads/1/3/1/8/131856333/9b3b0.pdf
    • http://kinutike.soggybottomretrievers.com/uploads/1/3/2/6/132681443/fuweforeroduriko.pdf
    • http://gowepip.jeanneschinto.com/uploads/1/3/2/7/132740764/fe3e14b8d5b.pdf
    • http://modolul.nasreenyazdani.com/uploads/1/3/2/8/132814930/fejiwumajuvije.pdf
    • https://015d7991-b3ae-4e29-8c76-58c358caba0d.filesusr.com/ugd/f1780b_d86b4ca912f249708489cba8de60354e.pdf?index=true
    • https://6638e115-96f3-452e-8543-651a71267c0d.filesusr.com/ugd/0a84ca_df797217d91b459485e3138c45803de5.pdf?index=true
    • https://a3d036c7-ea9b-4f9d-b703-51e3d03d35fd.filesusr.com/ugd/a382ee_148c1a06ba9b484fbb01debcc0fba9fa.pdf?index=true
    • https://32dc5d06-f4b1-485d-8081-dc522aef8049.filesusr.com/ugd/96564c_124d8c6eb2e042f598fd9fdd439b88e1.pdf?index=true
    • https://dd745c86-a8db-4972-b6db-b5abf8d1f4e6.filesusr.com/ugd/4733ca_6fafc57f347543ea9930ad88dbfc393a.pdf?index=true
    • https://eac62c59-ee09-4e2a-b473-e72edf2c4cd8.filesusr.com/ugd/e0d0cf_e8d3a19f6d1247d0abc953aea2f7117f.pdf?index=true
    • https://7840a9a4-e5ec-4f93-8ff6-148fe8cc319c.filesusr.com/ugd/28146e_184a73ae3e3b4bdea62fe0327f1f00e4.pdf?index=true
    • https://797ca23a-1685-425a-8c25-52598b1d6d22.filesusr.com/ugd/227d0f_2bab7d45c1f641c0aac0a3d3b49276e7.pdf?index=true
    • https://0d8f1496-4cab-4735-ad03-73f722f73c02.filesusr.com/ugd/10a4aa_7da0d0c6452a4ef68c5d67fafdec7eff.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/
    • https://797ca23a-1685-425a-8c25-52598b1d6d22.filesusr.com/ugd/227d0f_2bab7d45c1f641c

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000757e.bin
32eb1e2b0d441bb219b73aa3ed4fa9176725047e3d5aaba28e2abe98b6c42fbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x757E 5452 bytes
font_01_sfnt_off000087e7.bin
2b4d17e63de46488a27b3fc44b27602aee98e7dba62307edb3c1dab95d882d8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87E7 15380 bytes
font_02_sfnt_off0000b7e0.bin
f024ae4f9d35da3cc697386165ebb94ad9f215e957bc6cb81be716502f16845c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E0 16252 bytes
font_03_sfnt_off0000cd7c.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7C 4324 bytes

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