Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5669764ff041946…

MALICIOUS

PDF

73.9 KB Created: 2020-08-08 18:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc8be0888075aad012881e8c0f166e66 SHA-1: fda9ea6b8f67457a72000bf347ccd8d38b49d133 SHA-256: b5669764ff0419462804daadaf8d45c3bd6c7f95b5f437d12952d754d2fcf88b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector URL (https://ttraff.cc/pify?keyword=carbono+neutral+pdf). Another critical heuristic identified a PDF link farm, suggesting the document is part of a larger SEO manipulation or distribution scheme. The ML classifier also strongly indicated maliciousness. The document body text, though heavily obfuscated, contains the malicious URL, reinforcing its role as a lure.

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=carbono+neutral+pdf
    • http://tofagu.michiganate.org/uploads/1/3/2/6/132682883/91cbf.pdf
    • http://files.heartofgoldhedgehogs.com/uploads/1/3/1/6/131636642/nuxefibigaginosar.pdf
    • http://files.agateinspections.com/uploads/1/3/2/6/132682899/6fb4097.pdf
    • http://files.zachwroberts.com/uploads/1/3/2/3/132302992/telagon-rofutofotas-gixibakusi-lenumixuwejaser.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/nafakotifugumotabov.pdf
    • https://cdn.shopify.com/s/files/1/0437/1791/8870/files/bojapavaponoji.pdf
    • https://cdn.shopify.com/s/files/1/0440/2970/6390/files/historia_clinica_nutricional_formato.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0224/files/toludavozufuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/nukor.pdf
    • https://cdn.shopify.com/s/files/1/0430/5692/2777/files/judobigivopoworezavabu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0551/files/96740260659.pdf
    • https://cdn.shopify.com/s/files/1/0431/6892/3799/files/38327400525.pdf
    • https://cdn.shopify.com/s/files/1/0431/4149/6981/files/85932050342.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/rafigulatuxinipiso.pdf
    • https://cdn.shopify.com/s/files/1/0432/5205/6227/files/73313346967.pdf
    • https://cdn.shopify.com/s/files/1/0428/5091/0364/files/nec_article_210.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/
    • https://cdn.shopify.com/s/files/1/0440/2970/6390/files/historia_clinica_nutric

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3db.bin
70753749e1fc7f58fd4a6116c657edf2e8a645237d07c66d3610fa47a4c80191		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 4904 bytes
font_01_sfnt_off0000f48e.bin
3ee408dcdf1a0b234443c76463f083d09516dbdb43e146494466142c7f0077bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 11076 bytes

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