Malicious PDF — malware analysis report

Static analysis result for SHA-256 8736464562e6b9f0…

MALICIOUS

PDF

41.7 KB Created: 2020-08-12 01:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab0042c5d5621859ded4a2b4f616bfe5 SHA-1: 98666bb8f52ff988b6b1e42752119458370c517c SHA-256: 8736464562e6b9f072bcb3de1355049f4361b035a845094f0d31668b4566f6de
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 a redirector service known to host malicious content. The document body itself contains obfuscated text and URLs, suggesting an attempt to disguise its malicious intent. The primary goal appears to be directing users to potentially harmful external websites.

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=algorithms+illuminated+part+1+the+basics+pdf+download
    • http://files.brittanyleal.blog/uploads/1/3/1/3/131380848/zavidunema-fibujupe-jevulur-sepusibodidedum.pdf
    • http://files.daniellekelleytolbird.com/uploads/1/3/2/7/132740778/836e3.pdf
    • http://files.legendgolfcompany.com/uploads/1/3/1/0/131070459/8509951.pdf
    • http://files.cninc.org/uploads/1/3/2/7/132740479/5324237.pdf
    • http://gaxafisub.lauranaomiartisan.com/uploads/1/3/2/7/132712358/welanelopawox_vinuma_bifitove.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9105/1164/files/envision_math_grade_4_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4628/files/energias_renovables_introduccion.pdf
    • https://cdn.shopify.com/s/files/1/0436/5107/2158/files/20727223954.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/77603359417.pdf
    • https://cdn.shopify.com/s/files/1/0437/1018/5637/files/modern_geometrical_optics.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/wuton.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/psychology_of_colors.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27947700243.pdf
    • https://cdn.shopify.com/s/files/1/0436/8223/4521/files/reference_letter_for_teacher.pdf
    • https://cdn.shopify.com/s/files/1/0436/2164/6498/files/sinuvazixagerijijoxepo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054f1.bin
f70bd9bb9cdb23e61296a78e5f42b02c99e94020c7e2624fff29e7a46b125547		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54F1 4172 bytes
font_01_sfnt_off000063b5.bin
45568dd19c0970231fdb8325804cc68b9d61ce8b5e86a1e16f6121c236e1b9a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B5 5844 bytes
font_02_sfnt_off0000777c.bin
c62ef63fe5d610613e1ae927ce052b2a143ad02713481858835b059e830ac89a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x777C 9912 bytes

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