Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbc61caa5d69381…

MALICIOUS

PDF

55.0 KB Created: 2020-08-16 20:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e8534e3c3de0a58589bffbc7cb0ba60 SHA-1: a14b682e60f2eec7f21b573d99c38ab080b90601 SHA-256: 0cbc61caa5d69381d6ce9d1f38c1e36e1afae1ccaf94c106d67d0035a7058078
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains the same URL and a reference to 'wkhtmltopdf', suggesting it was generated programmatically to host this malicious link. The presence of numerous external PDF links further supports a link farm or redirection strategy.

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=a.+l.+u+full+form
    • http://files.katyoftheworld.com/uploads/1/3/0/8/130813514/timuman-jekovoko-najusuwapor.pdf
    • http://files.sdconference.org/uploads/1/3/1/3/131383444/9505325.pdf
    • http://files.laneycobb.com/uploads/1/3/1/6/131606111/nibelijuzosene_kekujad_mezaw_moput.pdf
    • http://files.cpyachtsales.com/uploads/1/3/1/4/131453484/wakadufaxo-nidovedat.pdf
    • http://files.newhopeoutreachchurch.com/uploads/1/3/1/0/131069869/3070976.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0434/8752/7078/files/dojufutifitezexobupuzero.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/27141943111.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7997453156.pdf
    • https://cdn.shopify.com/s/files/1/0436/1686/2371/files/english_grammar_in_use_vietnamese.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/zuponobegolu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6592/3992/files/manual_plc_allen_bradley_slc_500.pdf
    • https://cdn.shopify.com/s/files/1/0440/6149/1352/files/6662358900.pdf
    • https://cdn.shopify.com/s/files/1/0429/4773/9811/files/34066191023.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/31932512680.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_off00008151.bin
4da5dc7df32b522005c29e0be766f766429e57cfb9b9ee5b1ca21243a56d80fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8151 4544 bytes
font_01_sfnt_off000090ad.bin
078e9f20e10f7d7a4727eadd1f44121ca41e26d9b46f6250f410344c74c3cb4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90AD 2148 bytes
font_02_sfnt_off00009ad8.bin
2910581a2cae39120e6470b93be2a745aa3deccc6b64fb97dcdbbe120c2c8bb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AD8 16308 bytes

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