Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f70383dc370e6e…

MALICIOUS

PDF

35.4 KB Created: 2020-08-26 12:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b660ffa3820bf1158b9f25275e2dd05a SHA-1: 3ec4ae1311c937388b7d2bc00477c92e5641f81a SHA-256: c4f70383dc370e6e877e3e258a9716dc48a7d1696aae36f6799a530adefef357
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many of which point to redirector infrastructure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=letra+d+letrilandia+para+colorear, which is likely used to funnel users to further malicious content. The document body contains garbled text and embedded URLs, reinforcing the malicious link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=letra+d+letrilandia+para+colorear
    • http://fakafu.raisabreslava.com/uploads/1/3/1/3/131398285/mazagunitew-kopapipamisef.pdf
    • http://zegatu.mapleseedbirth.com/uploads/1/3/2/6/132681352/jiwazosojepegufa.pdf
    • http://files.maxxpeak.com/uploads/1/3/0/8/130874233/gexel.pdf
    • http://kalikori.alliedennydesigns.com/uploads/1/3/2/6/132681504/sezutijolorexu.pdf
    • http://gireva.fdryan.com/uploads/1/3/0/7/130776208/409fc3c09f0e.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/69432315854.pdf
    • https://cdn.shopify.com/s/files/1/0431/4677/2646/files/sulijewo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3457/files/askerlik_kanunu_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/9330/3204/files/89908141477.pdf
    • https://cdn.shopify.com/s/files/1/0431/8812/5857/files/rinoj.pdf
    • https://cdn.shopify.com/s/files/1/0440/2734/7109/files/paradox_of_choice_book.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5345/files/rojed.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1682/files/binomial_theorem_formula_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/3450/7426/files/checklist_formatos_mantenimiento_excel.pdf
    • https://cdn.shopify.com/s/files/1/0432/3541/0077/files/bokesi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3277/files/35309745781.pdf
    • https://cdn.shopify.com/s/files/1/0430/4352/0666/files/80744218958.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_off00004c68.bin
b9aa14b795339e36d46979022805fa84683fdd347869078d671c547408ae3076		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C68 4832 bytes
font_01_sfnt_off00005cd8.bin
268c3b8de105254314f987a1aad990041840451059743427744a50ae8b7beb54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD8 10584 bytes

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