Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6e213b24f5ad28…

MALICIOUS

PDF

62.5 KB Created: 2020-08-04 05:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84dc3f1fd9187356fed885b8501763cb SHA-1: d3cf543974352cb67aa9d4477f33dc45acac2ede SHA-256: 7d6e213b24f5ad284f787564d125b69b03123eb1ba521b79cbe8b1a2c0e98a2c
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying it as a malicious redirector pointing to 'https://ttraff.ru/pify?keyword=a+to+z+dictionary+words+with+meaning+in+marathi+pdf'. Another heuristic flags it as a PDF link farm, indicating a potential SEO poisoning or spam campaign. The ML classifier strongly supports the malicious verdict.

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.ru/pify?keyword=a+to+z+dictionary+words+with+meaning+in+marathi+pdf
    • http://files.belarte-ardeco.com/uploads/1/3/0/8/130814065/padutu.pdf
    • http://vodatijiv.advancedceramicproducts.com/uploads/1/3/2/3/132302978/ebd39d2fd.pdf
    • http://files.songyingfang.com/uploads/1/3/1/4/131437680/80572d523f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0428/6405/0332/files/pemupazunixupexogujisos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21096031872.pdf
    • https://cdn.shopify.com/s/files/1/0429/4184/1575/files/nesagetose.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0118/files/xasimigutipakivekune.pdf
    • https://cdn.shopify.com/s/files/1/0430/5122/1146/files/nirelebigerakegejupidipa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4554/files/66275391960.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54058680795.pdf
    • https://cdn.shopify.com/s/files/1/0432/0077/4308/files/94529590266.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7182/files/22835612195.pdf
    • https://cdn.shopify.com/s/files/1/0430/3002/0247/files/59661983237.pdf
    • https://cdn.shopify.com/s/files/1/0433/4475/6901/files/95293107050.pdf
    • https://cdn.shopify.com/s/files/1/0438/3870/1728/files/pals_study_guide_2017.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_off000094c4.bin
02146b08e2d08d3a1f801f459bb69092830a6cc40457b2d2be79bb8aec88e6c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94C4 5768 bytes
font_01_sfnt_off0000a869.bin
c8c590ed874673554524e9e5779750ec57b2fd3b7a304dc1cf71fb515d91ce7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA869 9896 bytes
font_02_sfnt_off0000ca92.bin
818bfc4d5ac2ac823aa404d27d7daee2e2a1d0f4b8f4c6322b55eeead91de0cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA92 10232 bytes

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