Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7240a3b9280cc33…

MALICIOUS

PDF

52.3 KB Created: 2020-10-31 02:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cb8faff0a584c39395b31461802152d SHA-1: 14fa9633cad1c04fe5f52eea51d125aee68f660e SHA-256: c7240a3b9280cc338a35ce4eeca71fa1235738f4dd6feaf54a69c117b2af9ffd
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to external PDF files, which is indicative of a link farm. One of the primary links, https://cctraff.ru/aws?keyword=gin+rummy+mod+apk+android+1, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to disguise its true purpose.

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://cctraff.ru/aws?keyword=gin+rummy+mod+apk+android+1
    • https://cdn-cms.f-static.net/uploads/4417137/normal_5f9c906c40d05.pdf
    • https://cdn-cms.f-static.net/uploads/4369779/normal_5f87fced16cd6.pdf
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f993455bfaa7.pdf
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5f871cfd8f9b1.pdf
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f99125e7a05f.pdf
    • https://cdn-cms.f-static.net/uploads/4406466/normal_5f977f0a2bf02.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/susopuzupure/54017020101.pdf
    • https://cdn.shopify.com/s/files/1/0498/2652/9435/files/13530624078.pdf
    • https://s3.amazonaws.com/bizamesuwepe/xikagasofowabe.pdf
    • https://cdn.shopify.com/s/files/1/0503/1788/5598/files/active_and_passive_voice_interrogative_sentences.pdf
    • https://cdn.shopify.com/s/files/1/0266/8619/3860/files/gilewiretidesilededune.pdf
    • https://cdn.shopify.com/s/files/1/0459/2241/8839/files/3642377709.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006668.bin
d84be0fcd2be88c11e7b8dfef9a9890779b938685e59186e8b3f9cf382ec11f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6668 4828 bytes
font_01_sfnt_off000076b5.bin
413ac582086e65cee7f8cab29fe4c57aa67b23621ddd4241dc6100ea786dbf43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B5 11588 bytes
font_02_sfnt_off00009e91.bin
82b32699d950f0d2801881094b97f6a3b10b5d147672c8518649046776eee3b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E91 16272 bytes
font_03_sfnt_off0000b42a.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB42A 4324 bytes

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