Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9068a7650682c0…

MALICIOUS

PDF

46.9 KB Created: 2020-08-12 21:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fcef7501828094256b5f2dd32d2a2e0 SHA-1: 5a36077c1f0c3c014865b89ac9007614deedd78e SHA-256: 8c9068a7650682c08381f91444d94857ab2c46a59860f804797896d9e091fb45
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The primary malicious URL identified is https://ttraff.ru/pify?keyword=bateria+ion+litio+funcionamiento+pdf. The document body, though heavily obfuscated, also contains this URL and other Shopify-hosted links, suggesting a lure to external content. No scripts were extracted from this sample.

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=bateria+ion+litio+funcionamiento+pdf
    • http://files.elizabethadabale.com/uploads/1/3/1/4/131453250/9202b3fae9.pdf
    • http://files.yankeebellechihuahuas.com/uploads/1/3/0/8/130874026/dalexajesudisub.pdf
    • http://dagipe.rodtannerlaw.com/uploads/1/3/0/7/130775934/f42cc65.pdf
    • http://files.naturaltouchhealing.com/uploads/1/3/1/4/131411474/5102878.pdf
    • http://xaver.yubakids.org/uploads/1/3/1/8/131872225/1882490.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/ielts_speaking_part_2_topics_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/7840/1700/files/jabazukudaborilarazazope.pdf
    • https://cdn.shopify.com/s/files/1/0434/0409/9740/files/wifom.pdf
    • https://cdn.shopify.com/s/files/1/0429/9040/3737/files/76542072155.pdf
    • https://cdn.shopify.com/s/files/1/0436/5372/6358/files/67339368893.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/viduzexugusen.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9662/files/natepebepefemimupepatet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/dsm_5_anorexia_nervosa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7138/files/caderno_de_encargos_sudecap.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/87304251038.pdf
    • https://cdn.shopify.com/s/files/1/0436/4438/7481/files/oxford_advanced_learner_dictionary_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3308/files/97139121135.pdf
    • https://cdn.shopify.com/s/files/1/0437/2430/8630/files/30033886.pdf
    • https://cdn.shopify.com/s/files/1/0438/4312/5413/files/levepit.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075ff.bin
9337182485debf7c6da983ec6d72a2855d1b9db2167424066272461edae0948b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75FF 5172 bytes
font_01_sfnt_off0000877f.bin
63800fbaf19597ad3d7d745bf5855a6247874f6f73248fc8a615367aec88dd27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x877F 11476 bytes

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